A backlight area dimming method, backlight, display device and medium

Abstract

A backlight area dimming method, a backlight source, a display device and a medium. Suitable for a display device with a backlight source. The method comprises: obtaining a first sub-image corresponding to the first backlight sub-area of the image to be displayed, determining the brightness of the first lamp bead according to the first gray scale information of each pixel in the first sub-image; obtaining an overlapping image corresponding to the overlapping area of the second backlight sub-area and the first backlight sub-area adjacent to the first side of the second backlight sub-area, and a non-overlapping image corresponding to the non-overlapping area of the second backlight sub-area and the first backlight sub-area adjacent to the first side of the second backlight sub-area; determining the brightness of the second lamp bead according to the second gray scale information of each pixel in the overlapping image and the third gray scale information of each pixel in the non-overlapping image. In the above manner, there is no obvious difference in the brightness of the first lamp bead and the second lamp bead, and the display quality of the image is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic equipment, in particular to a backlight area dimming method, a backlight source, a display device and a medium. BACKGROUND

[0002] With the development of display device technology, when determining the backlight of the display device, the cold cathode fluorescent lamp (CCFL) is usually not continued to be used to provide backlight for screen display, but the local dimming technology is adopted to adjust the local display screen.

[0003] The local dimming technology is to replace the CCFL backlight lamp with a backlight composed of hundreds of light-emitting diodes. The backlight LED can be adjusted according to the brightness of the image. The brightness of the highlighted part of the display screen image can reach the maximum, while the dark part can reduce the brightness or even be turned off to achieve the best contrast. In this way, the reduction of the brightness of the dark area reduces the power consumption of the backlight. However, in this adjustment mode, since the brightness of each light-emitting diode is different, at the boundary between two light-emitting diodes with different brightness, obvious light-dark difference is easily generated, similar to the effect of mosaic, which affects the display performance of the display device.

[0004] Therefore, there is an urgent need for a backlight area dimming method, a backlight source, a display device and a medium for improving the display performance of the display device. SUMMARY

[0005] The present application provides a backlight area dimming method, a backlight source, a display device and a medium for improving the display performance of the display device.

[0006] In a first aspect, the present application provides a backlight area dimming method, which is applicable to a display device with a backlight source; a backlight area dimming method, which is applicable to a display device with a backlight source; the backlight source includes a plurality of first backlight partitions and a plurality of second backlight partitions; the first backlight partitions and the second backlight partitions are adjacent, and the first backlight partitions and the second backlight partitions have an overlapping area; the method comprises:

[0007] For any first backlight partition, a first partition image of a to-be-displayed image in the first backlight partition is obtained, and the brightness of the first lamp bead is determined according to the first gray scale information of each pixel in the first partition image.

[0008] For any second backlight partition, an overlapping image corresponding to an overlapping area of the second backlight partition and a first backlight partition adjacent to a first side of the second backlight partition in the to-be-displayed image is obtained, and a non-overlapping image corresponding to a non-overlapping area of the second backlight partition and the first backlight partition adjacent to the first side of the second backlight partition is obtained; and the luminance of the second lamp bead is determined according to second gray scale information of each pixel in the overlapping image and third gray scale information of each pixel in the non-overlapping image.

[0009] In the above steps, each first backlight partition and the adjacent second backlight partition have an overlapping area, so that when the luminance of the lamp bead of the partition is determined, the gray scale of each pixel in the overlapping area is the same because the overlapping area is used for calculation by the adjacent two areas, and thus there is no obvious difference in the luminance of the first lamp bead and the second lamp bead, the transition is more natural in actual image display, there is no obvious boundary at the edge, the mosaic effect is avoided, and the display quality of the image is improved.

[0010] In a possible implementation, the luminance of the first lamp bead is determined according to the first gray scale information of each pixel in the first partition image, including:

[0011] The gray scale of the first partition image is determined according to the first gray scale information of each pixel in the first partition image.

[0012] The luminance of the first lamp bead is determined according to the gray scale of the first partition image.

[0013] In the above steps, the luminance of the first lamp bead is determined according to the gray scale information of each pixel in the first partition image, which is more consistent with the imaging process of the display panel, and the gray scale of the pixel is used to determine the luminance of the backlight lamp bead during the process, so that the display of each pixel is more matched with the luminance of the lamp bead, and a better imaging effect is achieved.

[0014] The luminance of the first lamp bead is determined according to the gray scale of the first partition image, including:

[0015] The median value of the gray scale of the first partition image is determined.

[0016] The light-emitting duty cycle of the first lamp bead is determined according to the ratio of the median value of the gray scale of the first partition image to the highest gray scale; and the light-emitting duty cycle is used to represent the luminance information.

[0017] In the above steps, because the median value reflects the medium level of the pixel gray scale information, and the highest gray scale corresponds to the initial luminance of the lamp bead, the luminance of the lamp bead is determined according to the ratio of the median gray scale to the highest gray scale, so that the luminance of the lamp bead is more matched with the gray scale of the image pixel, and the imaging effect is improved.

[0018] In a possible implementation manner, the brightness of the second lamp bead is determined according to the second gray scale information of each pixel in the overlapped image and the third gray scale information of each pixel in the non-overlapped image, and the brightness of the second lamp bead is determined according to the average value of the gray scales of the overlapped image and the median value of the gray scales of the non-overlapped image.

[0019] The gray scales of the overlapped image are determined according to the second gray scale information of each pixel in the overlapped image.

[0020] The gray scales of the non-overlapped image are determined according to the third gray scale information of each pixel in the non-overlapped image.

[0021] The brightness of the second lamp bead is determined according to the average value of the gray scales of the overlapped image and the median value of the gray scales of the non-overlapped image.

[0022] In the above manner, the overlapped region can be regarded as a transition region of the first backlight subregion and the second backlight subregion, the average value of the overlapped region is used as one factor for determining the brightness of the second lamp bead, so that the brightness of the second lamp bead is closer to the first lamp bead, and the median value of the gray scales of the non-overlapped image is introduced as another factor for determining the brightness of the second lamp bead, so that the brightness of the second lamp bead is more consistent with the characteristics of the image in the second backlight subregion, thereby making the second subregion image have a better imaging effect when the second lamp bead provides a light source, and there is no obvious brightness difference between the first subregion image and the second subregion image, so as to avoid a mosaic effect, thereby realizing higher imaging accuracy.

[0023] In a second aspect, an embodiment of the present application provides a backlight source, which comprises:

[0024] The backlight source comprises a plurality of first backlight subregions and a plurality of second backlight subregions.

[0025] A first lamp bead is arranged in the middle of any first backlight subregion, and a second lamp bead is arranged in the middle of any second backlight subregion.

[0026] The first backlight subregion and the second backlight subregion are adjacent, and the first backlight subregion and the second backlight subregion have an overlapped region.

[0027] The area of the second backlight subregion can be completely different from that of the first backlight subregion when the second backlight subregion is divided, for example, the second backlight subregion can be divided in two directions respectively. Alternatively, the areas of the first backlight subregions can also be different when the first backlight subregion is divided.

[0028] In a possible implementation manner, the plurality of first backlight subregions are obtained by equidistant division on the backlight source.

[0029] The plurality of second backlight subregions are obtained by division along the first lamp bead on the backlight source.

[0030] In a possible implementation, the backlight source is configured to provide a light source for a to-be-displayed image of the display panel; the to-be-displayed image includes an overlapping image and a non-overlapping image.

[0031] The overlapping image is an image corresponding to an overlapping area of the second backlight sub-area and a first backlight sub-area adjacent to a first side of the second backlight sub-area.

[0032] The non-overlapping image is an image corresponding to a non-overlapping area of the second backlight sub-area and the first backlight sub-area adjacent to the first side of the second backlight sub-area.

[0033] In a possible implementation, a first set luminance value of the second lamp bead located in the edge area of the backlight source is proportional to an area of the second backlight area where the second lamp bead is located and is smaller than a second set luminance value of the first lamp bead.

[0034] Since the backlight sub-area corresponding to the edge area is relatively small, the smaller sub-area area and the change of the sub-area shape have a certain influence on the actual presentation of the luminance, and therefore, by means of the above steps, the luminance of the lamp bead in the edge backlight sub-area is appropriately reduced according to the area of the edge sub-area, the matching degree of the lamp bead luminance and the actual required luminance can be effectively improved, and the display effect of the image is better.

[0035] In a third aspect, an embodiment of the present application provides a display device, which comprises:

[0036] a display panel, a backlight source, a processor, and a backlight driving component;

[0037] The backlight source comprises a plurality of first backlight sub-areas and a plurality of second backlight sub-areas; the first backlight sub-areas and the second backlight sub-areas are adjacent, and the first backlight sub-areas and the second backlight sub-areas have overlapping areas;

[0038] The processor is configured to:

[0039] For any first backlight sub-area, a first sub-area image of a to-be-displayed image corresponding to the first backlight sub-area is obtained, and the luminance of the first lamp bead is determined according to first gray scale information of each pixel in the first sub-area image;

[0040] For any second backlight sub-area, an overlapping image corresponding to an overlapping area of the second backlight sub-area and a first backlight sub-area adjacent to a first side of the second backlight sub-area, and a non-overlapping image corresponding to a non-overlapping area of the second backlight sub-area and the first backlight sub-area adjacent to the first side of the second backlight sub-area are obtained; and the luminance of the second lamp bead is determined according to second gray scale information of each pixel in the overlapping image and third gray scale information of each pixel in the non-overlapping image.

[0041] The backlight driving component is configured to drive the first lamp bead and the second lamp bead to provide a light source for the display panel.

[0042] The backlight driving component can include a first backlight driving component and a second backlight driving component. The first backlight driving component is configured to drive the first lamp bead, and the second backlight driving component is configured to drive the second lamp bead. The first backlight driving component and the second backlight driving component can have the same or different current and voltage. For example, the area of the first backlight partition is larger than that of the second backlight partition, and the voltage and current of the first backlight driving component should also be greater than those of the second backlight partition.

[0043] In a fourth aspect, the embodiments of the present application provide a computer readable storage medium, which stores a computer program. When the computer program is executed, the method in any one of the first aspect is performed.

[0044] The beneficial effects of the second aspect to the fourth aspect are specifically referable to the beneficial effects achievable by any one of the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 An application scenario provided by the embodiments of the present application is exemplarily shown;

[0046] Figure 2 An area backlight diagram provided by the embodiments of the present application is exemplarily shown;

[0047] Figure 3 A flow diagram of an area backlight dimming method provided by the embodiments of the present application is exemplarily shown;

[0048] Figure 4 A first backlight partition diagram provided by the embodiments of the present application is exemplarily shown;

[0049] Figure 5 A gray scale diagram of a first partition image provided by the embodiments of the present application is exemplarily shown;

[0050] Figure 6 A second backlight partition diagram provided by the embodiments of the present application is exemplarily shown;

[0051] Figure 7 A backlight diagram provided by the embodiments of the present application is exemplarily shown;

[0052] Figure 8 Another backlight diagram provided by the embodiments of the present application is exemplarily shown;

[0053] Figure 9 Another first backlight partition diagram provided by the embodiments of the present application is exemplarily shown;

[0054] Figure 10 An exemplary schematic diagram of another first backlight partition provided in an embodiment of this application is shown;

[0055] Figure 11 This illustration shows another backlight schematic diagram provided in an embodiment of this application;

[0056] Figure 12 This illustration shows another backlight schematic diagram provided in an embodiment of this application;

[0057] Figure 13 An exemplary schematic diagram of various gray levels of an overlapping image provided in an embodiment of this application is shown;

[0058] Figure 14 An exemplary schematic diagram of various gray levels of a non-overlapping image provided in an embodiment of this application is shown;

[0059] Figure 15 An exemplary schematic diagram of a display device provided in an embodiment of this application is shown;

[0060] Figure 16 A schematic diagram of the structure of another display device provided in an embodiment of this application is shown as an example;

[0061] Figure 17 An exemplary schematic diagram of a backlit area dimming display device provided in an embodiment of this application is shown. Detailed Implementation

[0062] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0063] Figure 1 This illustration shows an application scenario provided by an embodiment of the present application, such as... Figure 1 As shown, when displaying images on the display panel 102 of a display device, a screen backlight is required for illumination. For example, in the LCD screen of a laptop or television, the backlight 101 emits light as a light source, which is then transmitted or reflected through the liquid crystal molecule layer to form an image. Here, light-emitting diode (LED) backlight refers to using LEDs as the backlight 101 of the LCD screen. Compared with the traditional CCFL backlight 101, LEDs have the characteristics of low power consumption, low heat generation, high brightness, and long lifespan.

[0064] In the prior art, when adjusting the backlight of the display panel 102, a partition light adjustment method is mainly used. Figure 2 An exemplary schematic diagram of a regional backlight is shown in FIG. 1. As shown in FIG. 1, in a square backlight region, 25 equal sub-regions are divided, and a lamp bead is arranged in the middle of each sub-region, thus forming an array of square arrangement of lamp beads. The brightness of the lamp bead is determined according to the gray scale information of all the pixels in the sub-region where the lamp bead is located. For example, in the sub-region 1-1, the brightness of the lamp bead is determined according to the gray scale information of all the pixels in the sub-region 1-1. Exemplarily, the average value of all the pixel gray scale values is calculated, and the position of the average value in the gray scale level is determined, and then the brightness percentage of the lamp bead is corresponded, and it is assumed that the brightness of the lamp bead should be 80%. Using the same calculation method, in the sub-region 1-2, it is assumed that the brightness of the lamp bead should be 40%. Since the original brightness of the lamp beads is the same, the brightness of the lamp beads in the two adjacent sub-regions 1-1 and 1-2 is different by 40%, and in the vision, the brightness of the two sub-regions is very different, and at the junction, a significant bright-dark difference can be generated, and thus the display effect of the display panel 102 is poor. Figure 2

[0065] Therefore, the present application provides a regional backlight light adjustment method to avoid the problem of obvious difference in the backlight of the sub-regions, and improve the display effect of the display panel 102.

[0066] Figure 3 An exemplary schematic diagram of the flow of the regional backlight light adjustment method provided by the present application is shown in FIG. 2. The method is applicable to a display device with a backlight source 101. The backlight source includes a plurality of first backlight partitions and a plurality of second backlight partitions. The first backlight partitions and the second backlight partitions are adjacent, and the first backlight partitions and the second backlight partitions have an overlapping region. The method includes the following steps.

[0067] In step 301, for any first backlight partition, a first sub-region image of a to-be-displayed image corresponding to the first backlight partition is acquired.

[0068] In step 302, the brightness of a first lamp bead is determined according to the first gray scale information of each pixel in the first sub-region image.

[0069] In step 303, for any second backlight partition, an overlapping image of the to-be-displayed image corresponding to the overlapping region of the second backlight partition and the first backlight partition adjacent to the first side of the second backlight partition, and a non-overlapping image of the to-be-displayed image corresponding to the non-overlapping region of the second backlight partition and the first backlight partition adjacent to the first side of the second backlight partition are acquired.

[0070] In step 304, the brightness of a second lamp bead is determined according to the second gray scale information of each pixel in the overlapping image and the third gray scale information of each pixel in the non-overlapping image.​

[0071] Figure 4 An exemplary schematic diagram of a first backlight partition provided in an embodiment of this application is shown. Figure 4 As shown, each first backlight zone is obtained by dividing the backlight 101 at equal intervals; a first LED bead is set in the central area of ​​the first backlight zone.

[0072] like Figure 4 As shown, within a square backlight 101, the area is first divided into equidistant sections, resulting in first backlight zone 1, first backlight zone 2, first backlight zone 3, first backlight zone 4, first backlight zone 5, first backlight zone 6, first backlight zone 7, first backlight zone 8, and first backlight zone 9. An LED is placed in the center of each backlight zone. Figure 4 Black dots are used to represent them.

[0073] In step 302 above, the brightness of the first LED in each first backlight zone is calculated, and the specific implementation method is as follows:

[0074] Based on the first grayscale information of each pixel in the first partition image, the grayscale levels of the first partition image are determined. Each backlight partition corresponds to a partition image, and the first partition image is ultimately displayed on the display panel when the first backlight partition provides the light source. For the first partition image, each pixel has a certain grayscale level, i.e., grayscale. For example, in an 8-bit image, 2 to the power of 8 can be represented, which equals 256 grayscale levels, i.e., 256 grayscale levels. Therefore, the grayscale of each pixel in the first partition image can be calculated, and then all the grayscale levels of all pixels can be sorted from largest to smallest to determine the grayscale levels of the first partition image.

[0075] Figure 5 This example illustrates a schematic diagram of the grayscale levels of a first partitioned image provided in an embodiment of this application. For example... Figure 5 As shown, the lowest gray level of the first partition image is 0, the highest gray level is 230, the gray level with the most pixels is 120, and the gray level in the middle is 118 (the area below the curve occupies half on the left and half on the right).

[0076] Depend on Figure 5 The median value of each grayscale level in the first partition image is 118. Based on this median value and the ratio of the highest grayscale level in each grayscale level of the first partition image, the emission duty cycle of the first LED can be determined. Continuing with... Figure 5 For example, with a maximum grayscale of 255, the luminous duty cycle of the first LED can be calculated as 118 / 255*100% = 46%. The luminous duty cycle characterizes the brightness information of the LED in the following way:

[0077] The initial brightness of the LED bead is 100%. The duty cycle refers to the proportion of the on-time relative to the total time within a pulse cycle. By controlling the duty cycle of the LED bead, the ratio of its brightness to the initial brightness can be controlled. If the duty cycle of the first LED bead, calculated in the above steps, is 46%, then the proportion of the first LED bead's on-time in one cycle is 46%, and the time it is off-time is 54%. Therefore, the ratio of the first LED bead's brightness to its initial brightness is 46%. Because the duration of one cycle is very short, the on-off cycle of the first LED bead is very rapid, and the human eye can only perceive the overall change in brightness.

[0078] Figure 6 An exemplary schematic diagram of a second backlight partition provided in an embodiment of this application is shown, such as... Figure 6 As shown, the backlight 101 can be divided in another way, that is... Figure 5 The individual LEDs are connected and extended to the edge of the backlight 101, serving as the boundary lines for each of the second backlight zones. It should be understood that the boundary lines mentioned here are not physical baffles or other light-blocking objects, but only geometric dividing lines.

[0079] like Figure 6 As shown, the second backlight zones include: second backlight zone a, second backlight zone b, second backlight zone c, second backlight zone d, second backlight zone e, second backlight zone f, second backlight zone g, second backlight zone h, second backlight zone i, second backlight zone j, second backlight zone k, second backlight zone l, second backlight zone m, and second backlight zone n. A second LED is positioned in the center of each second backlight zone. Figure 6 White dots are used to represent the areas. In this division method, the area of ​​the second backlight zone located at the corner is smaller than that of the second backlight zone located in the middle, and the area of ​​the second backlight zone located at the four corners is the smallest.

[0080] because Figure 4 and Figure 6 Both refer to the division of backlight 101, and... Figure 4 and Figure 6 Merging to obtain Figure 7 To illustrate this clearly, the dividing line of the first backlight zone is marked with a thicker border. For example... Figure 7 Each of the second backlight zones shown overlaps with one or more first backlight zones.

[0081] In step 303 above, the second backlight zone located at the corner of the backlight 101, the second backlight zone located at the edge of the backlight 101, and the second backlight zone located in the middle of the backlight 101 are used as examples to illustrate how to determine the overlapping area and the non-overlapping area.

[0082] Example 1: The first side of the second backlight zone can be the left side of the second backlight zone. Based on the first backlight zone located to the left of the second backlight zone, the overlapping area and the non-overlapping area are determined.

[0083] For the second backlight zone located at corner 101 of the backlight:

[0084] by Figure 7 Taking the second backlight zone a as an example, there is no first backlight zone adjacent to it on the left side of the second backlight zone a. Therefore, the second backlight zone a has no overlapping area with the first backlight zone, and the entire range of the second backlight zone a is a non-overlapping area with the first backlight zone.

[0085] For the second backlight zone located at the edge of backlight 101:

[0086] by Figure 7 Taking the second backlight zone c as an example, the left side of the second backlight zone c is the first backlight zone 2, and the overlapping area with the first backlight zone 2 is region c2 (i.e., Figure 7 The area filled with square grids); the area that does not overlap with the first backlight zone 2 is region c3 (i.e., Figure 7 (The area filled with the horizontal line);

[0087] For the second backlight zone located in the middle of backlight 101:

[0088] by Figure 7 Taking the second backlight zone j as an example, the left side of the second backlight zone j is the first backlight zone 4 and the first backlight zone 7. The overlapping area with the first backlight zone 4 is the region j4 (i.e. Figure 7 The area filled with square grids); the overlapping area with the first backlight zone 7 is region j7 (i.e., Figure 7 The areas filled with square grids); the non-overlapping areas with the first backlight zone 4 or the first backlight zone 7 are areas j5 and j8 (i.e., Figure 7 (The area filled with the horizontal line).

[0089] Example 2: The first side of the second backlight zone can be the right side of the second backlight zone. Based on the first backlight zone located to the right of the second backlight zone, the overlapping area and the non-overlapping area are determined.

[0090] For the second backlight zone located at corner 101 of the backlight:

[0091] by Figure 8 Taking the second backlight zone a as an example, the right side of the second backlight zone a is the first backlight zone 1. Since the entire second backlight zone a is located within the first backlight zone, the entire range of the second backlight zone a is the overlapping area with the first backlight zone, denoted as a1 (i.e., Figure 7(The area filled with Chinese square grids), the second backlight zone a has no non-overlapping area with the first backlight zone.

[0092] For the second backlight zone located at the edge of backlight 101:

[0093] by Figure 8 Taking the second backlight zone c as an example, the right side of the second backlight zone c is the first backlight zone 3, and the overlapping area with the first backlight zone 3 is region c3 (i.e. Figure 8 The area filled with square grids); the area that does not overlap with the first backlight zone 2 is region c2 (i.e., Figure 8 (The area filled with the horizontal line);

[0094] For the second backlight zone located in the middle of backlight 101:

[0095] by Figure 8 Taking the second backlight zone j as an example, the right side of the second backlight zone j is the first backlight zone 5 and the first backlight zone 8. The overlapping area with the first backlight zone 5 is region j5 (i.e., Figure 8 The area filled with square grids); the overlapping area with the first backlight zone 8 is region j8 (i.e., Figure 8 The areas filled with square grids; the non-overlapping areas with the first backlight zone 5 or the first backlight zone 8 are areas j4 and j7 (i.e., Figure 8 (The area filled with the horizontal line).

[0096] Figure 9 An exemplary schematic diagram of yet another first backlight partition provided in an embodiment of this application is shown. For example... Figure 9 As shown, the area of ​​the first backlight zone can be completely different from that of the second backlight zone when dividing the backlight area. For example, it can be divided once in each of the two directions to obtain first backlight zone 1, first backlight zone 2, first backlight zone 3, and first backlight zone 4. An LED is placed in the middle of each backlight zone. Figure 9 Black dots are used to represent them.

[0097] Figure 10 An exemplary schematic diagram of another first backlight partition provided in an embodiment of this application is shown. Figure 10 As shown, the areas of the first backlight zones can also be made different when dividing the first backlight zones. For example... Figure 10 In the division shown, the area of ​​the first backlight partition 1 is the smallest, the area of ​​the first backlight partition 4 is the largest, and the areas of the first backlight partition 2 and the first backlight partition 3 are equal.

[0098] Based on the above Figure 9 and Figure 6 You can get something like Figure 11 The backlight schematic diagram shown is as follows: Figure 11As shown, the dividing lines between the first and second backlight zones coincide. Figure 11 In the same way as in Example 1 or Example 2 above, the overlapping and non-overlapping areas are determined. Since the dividing lines of the first backlight zone and the second backlight zone coincide, the first backlight zone and the second backlight zone have no overlapping areas. Therefore, each area in the second backlight zone is determined as a non-overlapping area.

[0099] Based on the above Figure 10 and Figure 6 You can get something like Figure 12 The backlight schematic diagram shown is as follows: Figure 12 As shown, if the overlapping and non-overlapping regions are determined in the manner described in Example 1 above, overlapping regions b1, f1, f3, j3, and n3 can be obtained, as follows: Figure 12 As shown in the square grid area, the remaining blank areas are non-overlapping areas.

[0100] After determining the overlapping and non-overlapping regions as described above, the overlapping image corresponding to the overlapping region and the non-overlapping image corresponding to the non-overlapping region can be further determined. Then, step 304 is executed to determine the brightness of the second LED. The overlapping image is the image displayed on the display panel, and its position on the display panel corresponds to the position of the overlapping region on the backlight. The non-overlapping image is similar to the overlapping image, and will not be described again here.

[0101] In step 304 above, the gray levels of the overlapping image can be determined based on the second gray level information of each pixel in the overlapping image; and the gray levels of the non-overlapping image can be determined based on the third gray level information of each pixel in the non-overlapping image. The specific implementation method can refer to the method described above for determining the gray levels of the first partition image based on the first gray level information of each pixel in the first partition image, and will not be repeated here.

[0102] Figure 13 An exemplary diagram illustrating the grayscale levels of an overlapping image provided in an embodiment of this application is shown. Figure 8 As shown, the lowest gray level of the overlapping image is 5, the highest gray level is 192, the gray level with the most pixels is 95, the gray level in the middle is 90 (the area below the curve occupies half on each side), and the average value of all gray levels is 85. Figure 13 (Not shown in the image).

[0103] Figure 14 This illustration demonstrates schematic diagrams of various gray levels of a non-overlapping image provided in an embodiment of this application. For example... Figure 14 As shown, the lowest gray level of the overlapping image is 5, the highest gray level is 255, the gray level with the most pixels is 172, and the gray level in the middle is 150 (the area below the curve occupies half on the left and half on the right).

[0104] Based on Figure 13 and Figure 14 The brightness of the second lamp bead can be determined according to the average value of each gray scale of the overlapping image and the median value of each gray scale of the non-overlapping image.

[0105] Optionally, the first light-emitting duty cycle of the second lamp bead can be determined according to the ratio of the average value of each gray scale of the overlapping image to the highest gray scale, that is, Figure 13 The first light-emitting duty cycle of the second lamp bead is 85 / 255*100% = 33%.

[0106] Optionally, the second light-emitting duty cycle of the second lamp bead can be determined according to the ratio of the median value of each gray scale of the non-overlapping image to the highest gray scale, that is, Figure 14 The second light-emitting duty cycle of the second lamp bead is 150 / 255*100% = 58%.

[0107] Further, the average value of the first light-emitting duty cycle 33% and the second light-emitting duty cycle 58%, that is, 46%, can be taken as the final light-emitting duty cycle of the second lamp bead, and the brightness of the second lamp bead is determined.

[0108] Based on the same technical concept, the embodiment of the present application also provides a backlight source 101. The backlight source includes a plurality of first backlight sub-zones and a plurality of second backlight sub-zones; a first lamp bead is arranged in the middle of any first backlight sub-zone; a second lamp bead is arranged in the middle of any second backlight sub-zone; the first backlight sub-zone and the second backlight sub-zone are adjacent, and the first backlight sub-zone and the second backlight sub-zone have an overlapping area.

[0109] In a possible implementation manner, the plurality of first backlight sub-zones are obtained by equally dividing the backlight source; and the plurality of second backlight sub-zones are obtained by dividing the backlight source along the first lamp bead.

[0110] In a possible implementation manner, the backlight source is used to provide a light source for a to-be-displayed image of a display panel; the to-be-displayed image includes an overlapping image and a non-overlapping image; the overlapping image is an image corresponding to an overlapping area of the second backlight sub-zone and a first backlight sub-zone adjacent to a first side of the second backlight sub-zone; and the non-overlapping image is an image corresponding to a non-overlapping area of the second backlight sub-zone and the first backlight sub-zone adjacent to the first side of the second backlight sub-zone.

[0111] In a possible implementation manner, the first set brightness value of the second lamp bead located in the edge area of the backlight source is proportional to the area of the second backlight sub-zone where the second lamp bead is located and is smaller than the second set brightness value of the first lamp bead.

[0112] This is because the backlight sub-zone located in the edge area is relatively small, for exampleFigure 6 In the second backlight partition a, the second backlight partition d, the second backlight partition m, the second backlight partition p, only 1 / 4 of the middle second backlight partition, the second backlight partition b, the second backlight partition c, the second backlight partition e, the second backlight partition h, the second backlight partition i, the second backlight partition l, the second backlight partition n, the second backlight partition o, only 1 / 2 of the middle second backlight partition.

[0113] Because the backlight partition corresponding to the edge area is relatively small, the smaller partition area and the change of the partition shape have a certain influence on the actual presentation of the brightness, therefore, by the above steps, the brightness of the lamp beads in the edge backlight partition is appropriately reduced according to the area of the edge partition, which can effectively improve the matching degree of the lamp bead brightness and the actual required brightness, so that the display effect of the image is better.

[0114] Based on the same technical concept, the embodiment of the present application also provides a display device. Figure 15 Exemplarily show the structure schematic diagram of a display device provided by the embodiment of the present application, as shown in the figure, Figure 15 The display device comprises:

[0115] The display panel, the backlight source, the processor and the backlight driving component;

[0116] The backlight source comprises a plurality of first backlight partitions and a plurality of second backlight partitions; the first backlight partitions and the second backlight partitions are adjacent, and the first backlight partitions and the second backlight partitions have an overlapping area;

[0117] The processor is used for:

[0118] For any first backlight partition, the first partition image of the to-be-displayed image corresponding to the first backlight partition is acquired, and the brightness of the first lamp bead is determined according to the first gray scale information of each pixel in the first partition image;

[0119] For any second backlight partition, the overlapping image corresponding to the overlapping area of the to-be-displayed image in the second backlight partition and the first backlight partition adjacent to the first side of the second backlight partition, and the non-overlapping image corresponding to the non-overlapping area of the to-be-displayed image in the second backlight partition and the first backlight partition adjacent to the first side of the second backlight partition are acquired; the brightness of the second lamp bead is determined according to the second gray scale information of each pixel in the overlapping image and the third gray scale information of each pixel in the non-overlapping image;

[0120] The backlight driving component is used for driving the first lamp bead and the second lamp bead to provide light source for the display panel.

[0121] Exemplarily, the display device can include a display panel driving component for driving the display panel to display the to-be-displayed image; and a display signal source for providing the to-be-displayed image information to the processor.

[0122] Exemplarily, the backlight driving component can include a first backlight driving component and a second backlight driving component. The first backlight driving component is configured to drive the first lamp bead, and the second backlight driving component is configured to drive the second lamp bead, as shown in the architecture. Figure 16 The current and voltage of the first backlight driving component and the second backlight driving component can be the same or different. For example, in the backlight source shown in Figure 12 Due to the area of the first backlight partition being larger than that of the second backlight partition, the voltage and current of the first backlight driving component should also be larger than those of the second backlight partition.

[0123] Based on the same technical concept, the embodiment of the present application also provides a backlight area dimming device. Figure 17 Exemplarily, a schematic diagram of the backlight area dimming device provided by the embodiment of the present application is shown. The device can execute the backlight area dimming method described above, as shown in Figure 17 The device includes:

[0124] The acquisition module is configured to acquire, for any first backlight partition, a first partition image of the to-be-displayed image corresponding to the first backlight partition; and acquire, for any second backlight partition, an overlapping image of the to-be-displayed image corresponding to an overlapping area of the second backlight partition and a first backlight partition adjacent to the first side of the second backlight partition, and a non-overlapping image of the to-be-displayed image corresponding to a non-overlapping area of the second backlight partition and the first backlight partition adjacent to the first side of the second backlight partition.

[0125] The determination module is configured to determine the brightness of the first lamp bead according to the first gray scale information of each pixel in the first partition image; and determine the brightness of the second lamp bead according to the second gray scale information of each pixel in the overlapping image and the third gray scale information of each pixel in the non-overlapping image.

[0126] In a possible implementation, the determination module is specifically configured to determine the gray scale of each pixel in the first partition image according to the first gray scale information of each pixel in the first partition image; and determine the brightness of the first lamp bead according to the gray scale of the first partition image.

[0127] In a possible implementation, the determination module is specifically configured to determine the median value of the gray scale of the first partition image; determine the light-emitting duty cycle of the first lamp bead according to the ratio of the median value of the gray scale of the first partition image to the highest gray scale of the gray scale of the first partition image; and the light-emitting duty cycle is used to represent the brightness information.

[0128] In a possible implementation, the determining module is specifically configured to: determine the gray levels of the superimposed image according to the second gray information of each pixel in the superimposed image; determine the gray levels of the non-superimposed image according to the third gray information of each pixel in the non-superimposed image; and determine the brightness of the second lamp bead according to the average value of the gray levels of the superimposed image and the median value of the gray levels of the non-superimposed image.

[0129] Based on the same technical concept, the embodiment of the present application also provides a computer readable storage medium, which realizes the method corresponding to any of the above embodiments when the computer program product runs on a processor.

[0130] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage, etc.) containing computer-usable program code.

[0131] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions.

[0132] These computer program instructions can also be stored in a computer readable memory that can direct the computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce a manufactured product including instruction devices that realize the functions specified in the flowcharts Figure 1 one or more flows and / or blocks Figure 1 one or more flows and / or blocks

[0133] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. A method of local dimming of a backlight, characterized in that, The method is suitable for a display device with a backlight source; the backlight source comprises a plurality of first backlight sub-zones and a plurality of second backlight sub-zones; The first backlight sub-zones are obtained by equidistant division on the backlight source, and a first lamp bead is arranged in the middle of any first backlight sub-zone; The second backlight sub-zones are obtained by connecting each first lamp bead and extending to the edge of the backlight source as a boundary line of each second backlight sub-zone; A second lamp bead is arranged in the middle of any second backlight sub-zone, the area of the second backlight sub-zone located at a corner is smaller than that of the second backlight sub-zone located in the middle, the area of the second backlight sub-zone located at a corner is the smallest, and the first backlight sub-zone and the second backlight sub-zone have an overlapping area; the method comprises: For any first backlight sub-zone, a first sub-zone image corresponding to the first backlight sub-zone in a to-be-displayed image is obtained, and the brightness of the first lamp bead is determined according to the first gray scale information of each pixel in the first sub-zone image; For any second backlight sub-zone, an overlapping image corresponding to the overlapping area of the second backlight sub-zone and the first backlight sub-zone adjacent to the first side of the second backlight sub-zone, and a non-overlapping image corresponding to the non-overlapping area of the second backlight sub-zone and the first backlight sub-zone adjacent to the first side of the second backlight sub-zone are obtained; the brightness of the second lamp bead is determined according to the average value of the first light-emitting duty cycle determined according to the second gray scale information of each pixel in the overlapping image and the second light-emitting duty cycle determined according to the third gray scale information of each pixel in the non-overlapping image; the first light-emitting duty cycle and the second light-emitting duty cycle are both used to represent the brightness information.

2. The method of claim 1, wherein, According to the first gray scale information of each pixel in the first sub-zone image, the brightness of the first lamp bead is determined, comprising: According to the first gray scale information of each pixel in the first sub-zone image, the gray scales of the first sub-zone image are determined; According to the gray scales of the first sub-zone image, the brightness of the first lamp bead is determined.

3. The method of claim 2, wherein, According to the gray scales of the first sub-zone image, the brightness of the first lamp bead is determined, comprising: The median value of the gray scales of the first sub-zone image is determined; According to the ratio of the median value of the gray scales of the first sub-zone image to the highest gray scale, the light-emitting duty cycle of the first lamp bead is determined; the light-emitting duty cycle is used to represent the brightness information.

4. The method of claim 1, wherein, According to the first gray scale information of each pixel in the first sub-zone image, the brightness of the first lamp bead is determined, comprising: According to the second gray scale information of each pixel in the overlapping image, the gray scales of the overlapping image are determined; According to the third gray scale information of each pixel in the non-overlapping image, the gray scales of the non-overlapping image are determined; The first light-emitting duty cycle is determined according to the average value of the gray scales of the overlapping image, and the second light-emitting duty cycle is determined according to the median value of the gray scales of the non-overlapping image; The brightness of the second lamp bead is determined according to the average value of the first light-emitting duty cycle and the second light-emitting duty cycle.

5. A backlight comprising: The backlight source comprises a plurality of first backlight sub-zones and a plurality of second backlight sub-zones; Any first backlight sub-zone is provided with a first lamp bead in the middle; Any second backlight sub-zone is provided with a second lamp bead in the middle; The first backlight sub-zones are obtained by equidistant division on the backlight source, the plurality of second backlight sub-zones are obtained by division along the first lamp bead on the backlight source, the area of the second backlight sub-zone located at the corner is smaller than that of the second backlight sub-zone located in the middle, the area of the second backlight sub-zone located at the four corners is the smallest, and the first backlight sub-zone and the second backlight sub-zone have an overlapping area.

6. The backlight of claim 5, wherein, The backlight source is used for providing a light source for a display panel to display an image; the image to be displayed comprises an overlapping image and a non-overlapping image; The overlapping image is an image corresponding to the overlapping area of the second backlight sub-zone and the first backlight sub-zone adjacent to the first side of the second backlight sub-zone; The non-overlapping image is an image corresponding to the non-overlapping area of the second backlight sub-zone and the first backlight sub-zone adjacent to the first side of the second backlight sub-zone.

7. The backlight of claim 5 or 6, wherein, The first set brightness value of the second lamp bead located at the edge area of the backlight source is proportional to the area of the second backlight zone where the second lamp bead is located and is smaller than the second set brightness value of the first lamp bead.

8. A display device, characterized by comprising: Comprise: a display panel, a backlight source, a processor and a backlight driving component; The backlight source comprises a plurality of first backlight sub-zones and a plurality of second backlight sub-zones; The first backlight sub-zones are obtained by equidistant division on the backlight source, any first backlight sub-zone is provided with a first lamp bead in the middle; The second backlight sub-zone is a boundary line of each second backlight sub-zone obtained by connecting each first lamp bead and extending to the edge of the backlight source; Any second backlight sub-zone is provided with a second lamp bead in the middle, the area of the second backlight sub-zone located at the corner is smaller than that of the second backlight sub-zone located in the middle, the area of the second backlight sub-zone located at the four corners is the smallest, and the first backlight sub-zone and the second backlight sub-zone have an overlapping area; The processor is configured to: for any first backlight sub-zone, obtain a first sub-zone image corresponding to the first backlight sub-zone in the image to be displayed, and determine the brightness of the first lamp bead according to the first gray scale information of each pixel in the first sub-zone image; for any second backlight sub-zone, obtain an overlapping image corresponding to the overlapping area of the second backlight sub-zone and the first backlight sub-zone adjacent to the first side of the second backlight sub-zone in the image to be displayed, and obtain a non-overlapping image corresponding to the non-overlapping area of the second backlight sub-zone and the first backlight sub-zone adjacent to the first side of the second backlight sub-zone; and determine the brightness of the second lamp bead according to the average value of the first light emitting duty cycle determined according to the second gray scale information of each pixel in the overlapping image and the second light emitting duty cycle determined according to the third gray scale information of each pixel in the non-overlapping image; The first light emitting duty cycle and the second light emitting duty cycle are both used to represent the brightness information. The backlight driving component is configured to drive the first lamp bead and the second lamp bead to provide a light source for the display panel.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and when the computer program is executed, the method in any one of claims 1 to 4 is performed.

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