Backlight module, display device and driving method of display device

Abstract

The invention discloses a backlight module, a display device and a driving method of the display device. The backlight module comprises a substrate (100), the substrate (100) comprises an array area (101), and a plurality of light-emitting areas (200) arranged in an array are arranged in the array area (101). The plurality of light-emitting areas (200) comprise a plurality of first light-emitting areas (201) located in a peripheral area (1011) of the array area (101) and a plurality of second light-emitting areas (202) located in a middle area (1012) of the array area (101), and each first light-emitting area (201) and each second light-emitting area (202) comprise a plurality of light-emitting units (300). The plurality of light-emitting units (300) in the plurality of first light-emitting areas (201) comprise a plurality of first light-emitting units (301) which are in one-to-one correspondence with the plurality of light-emitting units (300) in the second light-emitting areas (202), and the centers of the plurality of first light-emitting units (301) in the first light-emitting areas (201) are located at the vertexes of the first polygon (401); the centers of the light-emitting units (300) in the second light-emitting areas (202) are located at the vertexes of the second polygons (402), the first polygons (401) and the second polygons (402) are similar graphs, and the light-emitting units (300) of at least one first light-emitting area (201) in the first light-emitting areas (201) further comprise the second light-emitting units (302).

Description

Backlight module, display device, and driving method of display device Technical Field

[0001] Embodiments of the present disclosure relate to a backlight module, a display device, and a method for driving the display device. Background Art

[0002] In recent years, with the development of the MLED industry, the application of MLED backlights has become increasingly widespread. MLEDs include Mini-LEDs (typically sized between 50μm and 300μm) and Micro-LEDs (typically smaller than 50μm). The LED chips used in MLED backlights are much smaller than those used in traditional backlights. This allows for more precise control of the backlight, which can improve the contrast and color accuracy of displays.

[0003] MLED backlights consist of a large number of tiny LED chips arranged in a matrix. Each LED chip, or group of chips, can be individually controlled, allowing for more precise backlight control than with traditional LED backlights. This allows for higher contrast because the backlight can be dimmed in areas of the screen that should be dark. Furthermore, this backlight can be adjusted to produce the correct color temperature for each scene, which can also improve the display's color accuracy.

[0004] Summary of the Invention

[0005] According to an embodiment of the present disclosure, a backlight module, a display device, and a driving method of the display device are provided.

[0006] According to at least one embodiment of the present disclosure, a backlight module is provided, comprising: a substrate, comprising an array area, wherein a plurality of light-emitting areas arranged in an array are arranged in the array area, wherein the array area comprises a peripheral area and a central area located inside the peripheral area, the plurality of light-emitting areas comprise a plurality of first light-emitting areas located in the peripheral area and a plurality of second light-emitting areas located in the central area, each of the first light-emitting areas and each of the second light-emitting areas comprises a plurality of light-emitting units, the number of the light-emitting units arranged in at least two of the plurality of second light-emitting areas is equal, the plurality of light-emitting units in the first light-emitting area comprise a plurality of first light-emitting units corresponding one-to-one to the plurality of light-emitting units in each of the at least two second light-emitting areas, the centers of the plurality of first light-emitting units in the first light-emitting area are located at the respective vertices of a first polygon, the centers of the light-emitting units in each of the at least two second light-emitting areas are located at the respective vertices of a second polygon, the first polygon and the second polygon are similar figures, and the plurality of light-emitting units in at least one of the plurality of first light-emitting areas also comprise a second light-emitting unit.

[0007] In the backlight module according to some examples of the present disclosure, the first polygon and the second polygon are identical in size and shape.

[0008] In the backlight module according to some examples of the present disclosure, the side length of the first polygon is smaller than the corresponding side length of the second polygon.

[0009] In the backlight module according to some examples of the present disclosure, the second light-emitting unit is located inside the first polygon.

[0010] In the backlight module according to some examples of the present disclosure, the distance between the center of the second light-emitting unit and the geometric center of the first polygon is less than 1 / 5 of the length of the shortest side of the first polygon.

[0011] In the backlight module according to some examples of the present disclosure, the center of the second light-emitting unit is located at the geometric center of the first polygon.

[0012] In the backlight module according to some examples of the present disclosure, the second light-emitting unit and the plurality of first light-emitting units are connected in series.

[0013] According to some examples of the present disclosure, the backlight module further includes: a wire located on the substrate and connecting the second light-emitting unit and the plurality of first light-emitting units in series, wherein the wire is axially symmetrically distributed relative to a straight line passing through the center of the second light-emitting unit.

[0014] In the backlight module according to some examples of the present disclosure, the second light emitting unit has a strip shape extending along a first direction parallel to the substrate, and the straight line extends along a second direction perpendicular to the first direction and parallel to the substrate.

[0015] In the backlight module according to some examples of the present disclosure, the second light-emitting unit is located outside the first polygon.

[0016] In the backlight module according to some examples of the present disclosure, the second light-emitting unit is located on a side of the plurality of first light-emitting units away from the second light-emitting area.

[0017] In the backlight module according to some examples of the present disclosure, at least one first light-emitting area in which the second light-emitting unit is provided is located at a corner position of the array area, wherein the first light-emitting units in the first light-emitting area include a corner light-emitting unit closest to the corner position, and the second light-emitting units include a first edge light-emitting unit located at the corner light-emitting unit away from the center of the array area.

[0018] In the backlight module according to some examples of the present disclosure, the first edge light-emitting unit is connected in series with the multiple first light-emitting units, and in the series circuit of the first edge light-emitting unit and the multiple first light-emitting units, the first edge light-emitting unit is located between the multiple first light-emitting units.

[0019] In the backlight module according to some examples of the present disclosure, in the series circuit, the number of the first light-emitting units on both sides of the first edge light-emitting unit is the same.

[0020] In the backlight module according to some examples of the present disclosure, the distance between the center of the first edge light-emitting unit and the center of the corner light-emitting unit in the first light-emitting area is smaller than the distance between the centers of any two adjacent first light-emitting units in the first light-emitting area.

[0021] In the backlight module according to some examples of the present disclosure, the first polygon includes a first side and a second side closest to the corner position of the array area, and one end of the first side is connected to one end of the second side, and the second light-emitting unit includes a second edge light-emitting unit located on a side of the first side away from the interior of the array area and a third edge light-emitting unit located on a side of the second side away from the interior of the array area.

[0022] In the backlight module according to some examples of the present disclosure, the second edge light-emitting unit and the third edge light-emitting unit are connected in series with one of the first light-emitting units to form a first series circuit, the one first light-emitting unit connected in series with the multiple second light-emitting units is a first light-emitting unit other than the corner light-emitting unit that is closest to the third edge light-emitting unit, and the other first light-emitting units among the multiple first light-emitting units are connected in series in sequence to form a second series circuit, and the two ends of the first series circuit and the second series circuit are respectively connected to each other to form a parallel circuit.

[0023] In the backlight module according to some examples of the present disclosure, the number of light-emitting units in the first series circuit and the number of light-emitting units in the second series circuit are the same.

[0024] In the backlight module according to some examples of the present disclosure, the first light-emitting area is located at a corner position of the array area, wherein the first light-emitting units in the first light-emitting area include a corner light-emitting unit closest to the corner position, the second light-emitting units include a first edge light-emitting unit located at the corner light-emitting unit away from the center of the array area, the first polygon includes a first side and a second side closest to the corner position of the array area, and one end of the first side is connected to one end of the second side, the second light-emitting units include a second edge light-emitting unit located on a side of the first side away from the interior of the array area and a third edge light-emitting unit located on a side of the second side away from the interior of the array area.

[0025] In the backlight module according to some examples of the present disclosure, the second edge light-emitting unit, the first edge light-emitting unit and the third edge light-emitting unit are connected in series in sequence to form a first series circuit, the multiple first light-emitting units are connected in series with each other to form a second series circuit, and the two ends of the first series circuit and the second series circuit are respectively connected to each other to form a parallel circuit.

[0026] In the backlight module according to some examples of the present disclosure, the second edge light-emitting unit, the first edge light-emitting unit, the third edge light-emitting unit and one first light-emitting unit are connected in series in sequence to form a first series circuit, the one first light-emitting unit connected in series with the multiple second light-emitting units is a first light-emitting unit other than the corner light-emitting unit that is closest to the third edge light-emitting unit, and the other first light-emitting units among the multiple first light-emitting units are connected in series in sequence to form a second series circuit, and the two ends of the first series circuit and the second series circuit are respectively connected to each other to form a parallel circuit.

[0027] In the backlight module according to some examples of the present disclosure, the center line of the first edge light emitting unit and the second edge light emitting unit is parallel to the first side, and the distance from the center of the second edge light emitting unit to the first side is 1 / 3 to 1 / 2 of the length of the first side.

[0028] In the backlight module according to some examples of the present disclosure, the center line connecting the first edge light emitting unit and the third edge light emitting unit is parallel to the second side, and the distance from the center of the third edge light emitting unit to the second side is 1 / 3 to 1 / 2 of the length of the second side.

[0029] In the backlight module according to some examples of the present disclosure, the ratio of the side length of the first polygon to the corresponding side length of the second polygon is greater than or equal to 2 / 3 and less than 1.

[0030] In the backlight module according to some examples of the present disclosure, the orthographic projection of the second edge light-emitting unit on the straight line where the first side of the first polygon is located at least partially overlaps with the first side, and the orthographic projection of the third edge light-emitting unit on the straight line where the second side of the first polygon is located at least partially overlaps with the second side.

[0031] In the backlight module according to some examples of the present disclosure, the perpendicular midline of the first side passes through the second edge light-emitting unit, and the perpendicular midline of the second side passes through the third edge light-emitting unit.

[0032] In the backlight module according to some examples of the present disclosure, an extension line of the second edge toward the outside of the array area passes through the second edge light-emitting unit, and an extension line of the first edge toward the outside of the array area passes through the third edge light-emitting unit.

[0033] In the backlight module according to some examples of the present disclosure, both the first polygon and the second polygon include a rectangular shape.

[0034] In the backlight module according to some examples of the present disclosure, the plurality of light-emitting units are all in a strip shape extending along a first direction, wherein the first direction is parallel to a long side of the rectangular shape.

[0035] In the backlight module according to some examples of the present disclosure, each light-emitting area includes a first terminal and a second terminal to provide driving power to multiple light-emitting units in the light-emitting area, and each light-emitting area is configured to be driven independently of each other.

[0036] In the backlight module according to some examples of the present disclosure, the array area includes a plurality of driving areas, and the light-emitting region of each driving area is connected to a driver located at one side of the array area.

[0037] In the backlight module according to some examples of the present disclosure, each of the driving areas includes multiple sub-driving areas, each sub-driving area includes multiple light-emitting areas arranged along the row direction and the column direction, and the first terminals of the multiple light-emitting areas in each sub-driving area are connected to the same first power line, and the first terminals of the multiple light-emitting areas in different sub-driving areas are connected to different first power lines.

[0038] In the backlight module according to some examples of the present disclosure, the second terminals of the plurality of light-emitting areas in the same sub-driving area are respectively connected to different second power lines, and the light-emitting areas located in different sub-driving areas and in the same column include light-emitting areas connected to the same second power line.

[0039] In the backlight module according to some examples of the present disclosure, in different sub-driving areas in the same driving area, multiple light-emitting areas located in two sub-driving areas and in the same column correspond one to one, and the second terminals of the corresponding light-emitting areas are connected to the same second power line.

[0040] In the backlight module according to some examples of the present disclosure, a reflective structure is arranged around at least some of the multiple light-emitting units, and the reflective structure forms a recess corresponding to the light-emitting unit, and the light-emitting unit is arranged in the recess.

[0041] According to at least one embodiment of the present disclosure, a backlight module is provided, comprising: a substrate, comprising an array area, wherein a plurality of light-emitting areas arranged in an array are arranged in the array area, wherein the array area comprises a peripheral area and a central area located inside the peripheral area, the plurality of light-emitting areas comprise a plurality of first light-emitting areas located in the peripheral area and a plurality of second light-emitting areas located in the central area, each of the first light-emitting areas and each of the second light-emitting areas comprises a plurality of light-emitting units, the number of the light-emitting units arranged in each of the first light-emitting areas and each of the second light-emitting areas is equal and the arrangement manner is the same, and when the same power supply signal is input, the light-emitting intensity of the light-emitting units in at least one of the first light-emitting areas is greater than the light-emitting intensity of the light-emitting units in the second light-emitting areas.

[0042] In the backlight module according to some examples of the present disclosure, the planar shape of the array area includes a polygon, and the at least one first light-emitting area is located at at least one corner of the array area.

[0043] According to at least one embodiment of the present disclosure, a display device is provided, comprising the backlight module according to any of the above embodiments.

[0044] According to at least one embodiment of the present disclosure, a driving method for a display device is provided, wherein the display device includes a backlight module and a liquid crystal display panel stacked on each other, the backlight module array area, wherein a plurality of light-emitting areas that are independently driven and arranged in an array are provided in the array area, the array area includes a peripheral area and a central area located inside the peripheral area, the plurality of light-emitting areas include a plurality of first light-emitting areas located in the peripheral area and a plurality of second light-emitting areas located in the central area, the liquid crystal display panel includes a plurality of sub-display areas, the sub-display areas include a plurality of first sub-display areas corresponding one-to-one to the plurality of first light-emitting areas and a plurality of second sub-display areas corresponding one-to-one to the plurality of second light-emitting areas, and the method includes : driving the multiple light-emitting areas to emit light and driving the transmittance of the multiple sub-display areas to display images, wherein the multiple first light-emitting areas and the multiple second light-emitting areas are driven to emit light so that the ratio of the light intensity emitted by at least one of the multiple first light-emitting areas to the grayscale value to be displayed by the corresponding first sub-display area is greater than the ratio of the light intensity emitted by the second light-emitting area to the grayscale value to be displayed by the corresponding second sub-display area; and / or driving the multiple first sub-display areas and the multiple second sub-display areas to display so that the ratio of the transmittance of at least one first sub-display area among the multiple first sub-display areas to the grayscale value to be displayed by the first sub-display area is greater than the ratio of the transmittance of the second sub-display area to the grayscale value to be displayed by the second sub-display area. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, rather than limiting the present disclosure.

[0046] FIG1 is a schematic diagram of planar zone brightness of a backlight unit.

[0047] 2A and 2B are schematic diagrams of the planar structure of a backlight module according to some embodiments of the present disclosure.

[0048] FIG3 shows a schematic planar structural diagram of a backlight module according to other embodiments of the present disclosure.

[0049] FIG4 is a schematic diagram showing the arrangement and connection of light-emitting units in a light-emitting area according to an embodiment of the present disclosure.

[0050] FIG5 is a schematic diagram showing the arrangement and connection of light-emitting units in a light-emitting area according to an embodiment of the present disclosure.

[0051] FIG6 is a schematic diagram showing the arrangement and connection of light-emitting units in a light-emitting area according to an embodiment of the present disclosure.

[0052] FIG7 is a schematic diagram showing the arrangement and connection of light-emitting units in a light-emitting area according to an embodiment of the present disclosure.

[0053] FIG8 is a schematic diagram showing the arrangement and connection of light-emitting units in a light-emitting area according to an embodiment of the present disclosure.

[0054] FIG9 is a schematic diagram showing the arrangement and connection of light-emitting units in a light-emitting area according to an embodiment of the present disclosure.

[0055] FIG10 is a schematic diagram showing the arrangement and connection of light-emitting units in a light-emitting area according to an embodiment of the present disclosure.

[0056] FIG11 is a schematic diagram of a wiring structure of a light-emitting unit for driving a light-emitting area according to some embodiments of the present disclosure.

[0057] FIG12 is a schematic diagram of a local wiring structure of a light-emitting area including a second light-emitting unit in a backlight module according to an embodiment of the present disclosure.

[0058] FIG13 is a schematic diagram of the planar structure of a backlight module according to an embodiment of the present disclosure.

[0059] FIG14 is a schematic diagram of a partial planar structure of a backlight module according to an embodiment of the present disclosure.

[0060] FIG15 is a schematic diagram of a partial cross-sectional structure of a backlight module according to an embodiment of the present disclosure.

[0061] FIG16 is a schematic diagram showing a driving signal without performing differentiated regulation on the peripheral and internal light-emitting areas.

[0062] FIG17 is a schematic diagram of a driving signal for differentially regulating the peripheral and internal light-emitting areas. DETAILED DESCRIPTION

[0063] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0064] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by persons of ordinary skill in the field to which this disclosure belongs. The words "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Words such as "upper", "lower", "left", "right" and the like only indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship will also change accordingly.

[0065] The full-screen brightness uniformity of the MLED backlight has a very important impact on the display quality of the display device. In addition, the MLED backlight is combined with HDR (High-Dynamic Range) technology to improve the brightness and contrast of the image. HDR can brighten the details of each dark area, make dark areas darker, and enrich more detailed colors, so that movies and pictures can present excellent effects. When testing the full-screen brightness uniformity of a display screen using HDR backlight, the brightness uniformity of the full screen (brightness uniformity = minimum brightness / maximum brightness) is only 50%. Excluding the four corner points, the brightness uniformity is increased to 75%. The main reason for the dark corner position is the halo characteristics of the MLED. As shown in Figure 1, the display screen is divided into several light-emitting areas arranged in a matrix. Due to the influence of the halo, for the light-emitting area located inside, other light-emitting areas around the light-emitting area can assist in the brightness generated by the light-emitting area. At the four corners, such as luminous areas 1, 3, 6, and 8 shown in Figure 1, the halo effect of the outer 3 / 4 area is absent. The luminous areas at the four edges, such as luminous areas 2, 4, 5, and 7 shown in Figure 1, lack the halo effect of the outer 1 / 2 area. Furthermore, some of these peripheral luminous areas may also produce brightness lower than that of the inner areas due to the halo effect, but the brightness difference between these areas and the inner areas is smaller than the brightness difference between the inner areas of the luminous areas at the corners and edges mentioned above. As schematically shown in Figure 1, near the corners, the brightness of luminous area 1 is lower than that of luminous area 1', which is lower than that of luminous area 1". Near the edges, the brightness of luminous area 2 is lower than that of luminous area 2', which is lower than that of luminous area 2". The brightness of other luminous areas near the corners and edges follows a similar pattern. Of course, the brightness comparison here is under the same driving conditions. For example, the above comparison is based on the algorithm for a white screen, comparing the brightness of each light-emitting area when the driving current and voltage of each light-emitting area are consistent. For example, the brightness drop of the light-emitting area at the edge or corner generally affects the light-emitting areas in the three outer layers of the light-emitting area array, but the light-emitting areas at the edge and corner are the most affected.

[0066] According to an embodiment of the present disclosure, a backlight module is provided. The backlight module includes: a substrate including an array region, wherein the array region is provided with a plurality of light-emitting zones arranged in an array. The array region includes a peripheral region and a central region located inside the peripheral region. The plurality of light-emitting zones include a plurality of first light-emitting zones located in the peripheral region and a plurality of second light-emitting zones located in the central region. Each first light-emitting zone and each second light-emitting zone includes a plurality of light-emitting units. The number of light-emitting units provided in each of the plurality of second light-emitting zones is equal. Although the number of light-emitting units provided in each second light-emitting zone is equal here, the embodiments of the present disclosure are not limited to this. For example, the number of light-emitting units provided in at least two second light-emitting zones may be equal. The plurality of light-emitting units in the first light-emitting zone includes a plurality of first light-emitting units that correspond one-to-one with the plurality of light-emitting units in the second light-emitting zone (e.g., a second light-emitting zone having an equal number of light-emitting units). The centers of the plurality of first light-emitting units in the first light-emitting zone are located at respective vertices of a first polygon, and the centers of the light-emitting units in the second light-emitting zone (e.g., a second light-emitting zone having an equal number of light-emitting units) are located at respective vertices of a second polygon, wherein the first polygon and the second polygon are similar shapes. In addition, the multiple light-emitting units of at least one of the multiple first light-emitting areas also include a second light-emitting unit. The backlight module according to the embodiment of the present disclosure also includes a second light-emitting unit in at least one first light-emitting area in the peripheral area of ​​the array area. Therefore, the number of light-emitting units it includes is greater than the number of light-emitting units in the second light-emitting area, thereby compensating for the dimming of the brightness of the peripheral area due to the halo effect. In addition, since the first light-emitting units of the first light-emitting area and the light-emitting units of the second light-emitting area are correspondingly arranged, the figures formed by the center connection lines are similar figures. The backlight module according to the embodiment of the present disclosure can prevent the wiring circuit or wiring pattern for driving the light-emitting unit in the peripheral area from being excessively changed due to the addition of the second light-emitting unit. Therefore, the embodiment of the present disclosure can improve the brightness problem of the light-emitting area in the peripheral area while maintaining compatibility with other designs.

[0067] For example, in some embodiments according to the present disclosure, the plurality of light-emitting units in the plurality of first light-emitting zones include a plurality of first light-emitting units that correspond one-to-one to the plurality of light-emitting units in the second light-emitting zone. The "one-to-one correspondence" here may mean that each light-emitting unit in the second light-emitting zone has a first light-emitting unit in the first light-emitting zone corresponding thereto. Therefore, the number of first light-emitting units in each first light-emitting zone is the same as the number of light-emitting units in each second light-emitting zone. Combined with the above-mentioned first polygon and second polygon being similar figures, the basic architecture of the light-emitting units in the first light-emitting zone and the second light-emitting zone is similar, so that the wiring circuit or wiring pattern for driving the light-emitting unit will not be excessively changed due to the addition of the second light-emitting unit in the first light-emitting zone. For example, the first light-emitting zone includes four first light-emitting units respectively located at the four vertices of a rectangle, and the second light-emitting zone also includes four light-emitting units located at the four vertices of the rectangle, but according to the embodiments of the present disclosure, there is no special limitation on the shapes of the first polygon and the second polygon.

[0068] According to some embodiments of the present disclosure, a backlight module is also provided, comprising: a substrate, comprising an array area, wherein a plurality of light-emitting areas arranged in an array are provided in the array area. The array area comprises a peripheral area and a central area located inside the peripheral area. The plurality of light-emitting areas comprises a plurality of first light-emitting areas located in the peripheral area and a plurality of second light-emitting areas located in the central area, and each first light-emitting area and each second light-emitting area comprises a plurality of light-emitting units. The number of the light-emitting units provided in each of the first light-emitting areas and each of the second light-emitting areas is equal and the arrangement is the same. When the same power signal is input, the light-emitting intensity of the light-emitting unit of at least one of the first light-emitting areas is greater than the light-emitting intensity of the light-emitting unit in the second light-emitting area. In the backlight module according to these embodiments of the present disclosure, the light-emitting areas in the peripheral area and the central area all use light-emitting units with the same arrangement and an equal number, but the light-emitting units in the peripheral area can use light-emitting units of a high brightness mode. Since the manufacturers of light-emitting units have multiple brightness levels for products of the same specifications, this solution of improving the brightness uniformity of the backlight module by distributing light-emitting units of different brightness levels in different areas will not change the original driving circuit layout design, thereby improving the brightness problem of the light-emitting area in the peripheral area without significantly increasing costs.

[0069] According to some other embodiments of the present disclosure, a driving method for a display device is also provided, wherein the display device includes a backlight module and a liquid crystal display panel stacked on each other, the backlight module includes an array area, a plurality of independently driven and arrayed light-emitting areas are provided in the array area, the array area includes a peripheral area and a central area located inside the peripheral area, the plurality of light-emitting areas include a plurality of first light-emitting areas located in the peripheral area and a plurality of second light-emitting areas located in the central area, the liquid crystal display panel includes a plurality of sub-display areas, the sub-display areas include a plurality of first sub-display areas corresponding one-to-one to the plurality of first light-emitting areas and a plurality of second sub-display areas corresponding one-to-one to the plurality of second light-emitting areas. The method includes: driving the plurality of light-emitting areas to emit light and driving the transmittance of the plurality of sub-display areas to display an image. The plurality of first light-emitting areas and the plurality of second light-emitting areas are driven to emit light, so that the ratio of the light intensity emitted by at least one of the plurality of first light-emitting areas to the grayscale value to be displayed by the corresponding first sub-display area is greater than the ratio of the light intensity emitted by the second light-emitting area to the grayscale value to be displayed by the corresponding second sub-display area; and / or the plurality of first sub-display areas and the plurality of second sub-display areas are driven to display, so that the ratio of the transmittance of at least one first sub-display area among the plurality of first sub-display areas to the grayscale value to be displayed by the first sub-display area is greater than the ratio of the transmittance of the second sub-display area to the grayscale value to be displayed by the second sub-display area. According to these embodiments of the present disclosure, the brightness problem of the light-emitting area in the peripheral area of ​​the backlight module is improved from the perspective of the product driving method, so that the structural design of the product itself will not be changed and no additional cost will be added.

[0070] Hereinafter, the backlight module, the display device and the driving method of the display device of the present disclosure will be described in more detail in combination with some exemplary embodiments of the present disclosure, so as to make the technical solution according to the present disclosure clearer.

[0071] FIG2 is a schematic diagram of the planar structure of a backlight module according to some embodiments of the present disclosure. As shown in FIG2 , the backlight module according to this embodiment includes a substrate 100. The substrate 100 includes an array area 101. For example, the array area 101 can occupy most of the planar area of ​​the substrate 100, thereby effectively utilizing most of the planar area of ​​the substrate. The distance between the respective edges of the array area 101 and the respective edges of the substrate is not particularly limited and can be arbitrarily set according to actual needs. For example, the array area 101 here is the area where the array-arranged light-emitting areas are arranged, and can also be referred to as the effective area of ​​the substrate of the backlight module. Of course, in order to achieve the purpose of a narrow bezel, the area of ​​the substrate located around the array area 101 can be made as small as possible. For example, the area located around the array area 101 (and the area located outside the array area 101 and surrounding the array area 101) can be provided with necessary wiring and other components. The embodiment according to FIG2 shows that the planar shape of the substrate 100 is generally rectangular, and the planar shape of the array area 101 is also generally rectangular. However, the embodiments of the present disclosure are not limited thereto. The planar shapes of the substrate 100 and array region 101 can be adjusted as needed. For example, they can be determined based on the shape of the display panel to which the backlight module is applied. For example, certain irregularly shaped display panels may require a backlight module of a corresponding shape. Furthermore, the planar shape of the array region 101 can also differ from the planar shape of the substrate 100.

[0072] As shown in Figures 2A and 2B, the substrate 100 includes an array area 101. A plurality of light-emitting areas 200 arranged in an array are provided within the array area 101. For example, the rectangular structures arranged in an array in Figures 2A and 2B represent the light-emitting areas 200, and in Figure 2A, the rectangular structures representing the light-emitting areas 200 are set as dashed frames to clearly illustrate the positional relationship of other areas. Figures 2A and 2B show 9 rows and 12 columns of light-emitting areas 200 arranged in a matrix, but this is merely exemplary. The light-emitting area 200 of the backlight module according to an embodiment of the present disclosure can have more or fewer light-emitting areas 200. The array area 101 includes a peripheral area 1011 and a central area 1012 located inside the peripheral area 1011. As shown in Figure 2A, the central area 1012 refers to the area surrounded by the small thick solid frame, and the peripheral area 1011 refers to the area between the large thick solid frame and the small thick solid frame. For example, the light-emitting area 200 in the peripheral area may include one circle (including rows and columns) or multiple circles (multiple rows and columns) of light-emitting areas. For example, when the first light-emitting area 201 includes one circle of light-emitting areas, it is the outermost circle of light-emitting areas; when the first light-emitting area 201 includes two circles of light-emitting areas, it is the outermost two circles of light-emitting areas. In the example shown in Figure 2A, an example of setting a circle of light-emitting areas in the peripheral area is shown, but the embodiments of the present disclosure are not limited to this. For example, the width of the peripheral area (that is, the number of circles of light-emitting units set in the peripheral area) can be adjusted according to the difference between the luminous brightness of the edge part of the backlight module and the luminous brightness of the central area. For example, the light-emitting area of ​​the peripheral area described here refers to one or more circumferentially arranged light-emitting areas located at the outermost circle of the array area. The meanings of the peripheral area and the central area of ​​the array area are the same in the following embodiments, and the subsequent description will omit repeated descriptions of this.

[0073] For ease of illustration, Figures 2B and 3 described below only illustrate the arrangement of the light-emitting areas within the array region 101, omitting the substrate 100 and the division of the array substrate into the peripheral and central regions. Furthermore, Figures 2B and 3 schematically illustrate the arrangement of the light-emitting units. However, the division of the peripheral and central regions of the array region in Figures 2B and 3 can refer to Figure 2A and its related description. The light-emitting area 200 may include a plurality of first light-emitting areas 201 located in the peripheral region 1011 and a plurality of second light-emitting areas 202 located in the central region 1012. For example, the light-emitting areas 200 located at the four edges of the array region are first light-emitting areas 201. For example, in the embodiment shown in Figure 2B, the backlight module includes 38 first light-emitting areas 201 (the outermost circle of light-emitting areas), including four first light-emitting areas 201 located at the corners of the array region. Second light-emitting areas 202 are the light-emitting areas outside the first light-emitting areas 201 of all light-emitting areas 200. Here, being located inside the first light-emitting area 201 means that compared with the first light-emitting area 201 , the second light-emitting area 201 is further away from the edge of the array area 101 .

[0074] For example, each first light-emitting zone 201 and each second light-emitting zone 202 includes multiple light-emitting units 300. The black dots arranged in an array in FIG2B represent light-emitting units. As shown in FIG2B , the number of light-emitting units 300 provided in each of the multiple second light-emitting zones 202 is equal. For example, the embodiment shown in FIG2B shows four light-emitting units 300 provided in each second light-emitting zone 202. However, the four light-emitting units here are merely exemplary, and more or fewer light-emitting units may be provided as needed. In FIG2B , for clarity, a light-emitting zone 200 located at a corner in the upper right corner of the array area 101 is magnified. The multiple light-emitting units 300 in the multiple first light-emitting zones 201 include multiple first light-emitting units 301 corresponding one-to-one to the multiple light-emitting units 300 in the second light-emitting zones 202. The centers of the multiple first light-emitting units 301 in the first light-emitting zones 201 are located at the vertices of the first polygon 401, and the centers of the light-emitting units 300 in the second light-emitting zones 202 are located at the vertices of the second polygon 402. For clarity of the diagram, FIG2B shows a first polygon 401 corresponding to a first light-emitting area 201 and a second polygon 402 corresponding to a second light-emitting area 202. It should be noted that the first polygon 401 and the second polygon 402 are merely for illustrating the arrangement of the light-emitting units and are not actual components. In the backlight module according to the embodiment of the present disclosure, the first polygon 401 and the second polygon 402 are similar figures. It should be noted that similar figures here include completely equal figures, that is, two figures that are completely equal in shape and size are also included in the category of similar figures. In the backlight module according to the embodiment of the present disclosure, the multiple light-emitting units 300 of at least one of the multiple first light-emitting areas 201 also include a second light-emitting unit 302. As shown in FIG2B , each of the four first light-emitting areas 201 located at the four corners of the array area 101 also includes a second light-emitting unit 302 in addition to the first light-emitting unit 301.

[0075] In the above embodiments, the first polygon and the second polygon are described using rectangles as an example, that is, each second light-emitting area includes four light-emitting units, and the arrangement is the same; each first light-emitting area includes four first light-emitting units, and the arrangement is the same. The same arrangement here means that the relative positions of the corresponding light-emitting units in the corresponding light-emitting areas are the same. However, according to the embodiments of the present disclosure, it is not limited to the case where the first polygon and the second polygon are rectangles. The first polygon and the second polygon may also be other shapes, for example, triangles, pentagons, hexagons, etc. In these cases, the number of light-emitting units in the second light-emitting area and the number of first light-emitting units in the first light-emitting area change accordingly.

[0076] In addition, in this specification, when only the "light-emitting unit" is mentioned, it may be the first light-emitting unit or the second light-emitting unit or include the first light-emitting unit and the second light-emitting unit, and when only the "light-emitting area" is mentioned, it may be the first light-emitting area or the second light-emitting area or include the first light-emitting area and the second light-emitting area.

[0077] Although FIG2B shows that the four first light-emitting areas 201 at the four corners include second light-emitting units 302, the embodiments of the present disclosure are not limited thereto. Alternatively, one, two, or three of the four corner light-emitting areas 201 may be provided with second light-emitting units 302. Alternatively, in addition to the light-emitting areas 201 at the corners, at least one first light-emitting area 201 at any edge of the array area 101 may be provided with second light-emitting units 302. In some other examples, the four first light-emitting areas 201 at the corners are not provided with second light-emitting units 302, but at least one first light-emitting area 201 at any edge of the array area 101 is provided with second light-emitting units 302. In some other examples, the four first light-emitting areas 201 at the four corners are all provided with second light-emitting units 302, and the four first light-emitting areas 201 at the center of the four edges of the array area 101 are also provided with second light-emitting units 302.

[0078] As shown in FIG2B , in this embodiment, the first light-emitting area 201 provided with the second light-emitting unit 302 is compared with the second light-emitting area 202. The first light-emitting units 201 in these first light-emitting areas 201 correspond one-to-one with the light-emitting units in the second light-emitting area 202. That is, the number of first light-emitting units 201 in these first light-emitting areas 201 is equal to the number of light-emitting units in the second light-emitting area 202. However, these first light-emitting areas 201 also include second light-emitting units 302. Therefore, the number of light-emitting units in these first light-emitting areas 201 is greater than the number of light-emitting units in the second light-emitting areas. Under this structure, the dimming of the brightness in the peripheral area of ​​the backlight module due to the halo effect can be compensated or made up, thereby improving the planar brightness uniformity of the backlight module and enhancing the display quality of the display device using the backlight module. In addition, the first polygon 401 and the second polygon 402 are similar figures. Therefore, the first light-emitting unit 301 in the first light-emitting area 201 and the light-emitting unit 300 in the second light-emitting area 402 are arranged correspondingly. Therefore, the backlight module can ensure that the peripheral area (the area occupied by the first light-emitting area) does not excessively change the wiring circuit or wiring pattern used to drive the light-emitting unit due to the addition of the second light-emitting unit 302. Therefore, the embodiment of the present disclosure can improve the brightness problem of the light-emitting area in the peripheral area while maintaining compatibility with other designs. In addition, when the shapes and sizes of the first polygon 401 and the second polygon 402 are equal, the design of the wiring circuit or wiring pattern in the peripheral area and the central area can be further simplified.

[0079] For example, the plurality of light-emitting units 300 in the plurality of light-emitting zones 200 may be connected in series, in parallel, or in a combination of series and parallel connections, so that the plurality of light-emitting units 300 in each light-emitting zone can be driven simultaneously. Examples of connection methods for the light-emitting units 300 in the first light-emitting zone 201 and the second light-emitting zone 202 are described below.

[0080] For example, the light-emitting unit 300 may include a packaged light-emitting diode chip, which includes a light-emitting diode chip and a packaging structure. The light-emitting diode chip may be a sub-millimeter light-emitting diode chip (miniLED). The size of the unpackaged light-emitting diode chip in the direction perpendicular to the substrate 100 may be 70 microns to 180 microns, and the maximum size of the unpackaged light-emitting diode chip in the direction parallel to the substrate 100 may not exceed 500 microns. For example, the light-emitting diode chips here may include Mini-LEDs (sizes between 50μm and 300μm) and Micro-LEDs (sizes less than 50μm). However, the backlight module according to the embodiments of the present disclosure is not limited thereto, and light-emitting diode chips of any other suitable size may also be used. For example, the light-emitting diode chip may use an inorganic LED chip, which is an LED chip made of inorganic materials with high brightness, high luminous efficiency, and a long service life. Compared with traditional organic LEDs, inorganic LEDs have higher brightness and better durability, and can provide better display effects. In addition, inorganic LEDs have better environmental performance and do not pollute the environment. The manufacturing process of inorganic LEDs generally includes steps such as material preparation, chip manufacturing, and packaging. The manufacture of inorganic LEDs requires high-purity inorganic materials and high-precision manufacturing processes to ensure their high brightness, high luminous efficiency and long service life. For example, the light-emitting unit used in the backlight module according to the present disclosure can be a light-emitting unit that emits white light, for example, a white light LED can be used. However, light-emitting units of other colors can also be used. In some embodiments, the light-emitting unit 300 can use a blue light LED, and then match it with a light-excitation material layer located in the light-emitting layer of the light-emitting unit 200, for example, a quantum dot material layer. In this structure, the blue light emitted by the LED is incident on the light-excitation material layer, thereby exciting the active components (for example, quantum dots) in the light-excitation material layer to emit light of various colors to mix into white light.

[0081] In the embodiment shown in FIG2B , the second light-emitting unit 302 is located inside the first polygon 401, and the first light-emitting area 201 in which the second light-emitting unit 302 is located has only one second light-emitting unit 302. However, the embodiments of the present disclosure are not limited thereto; the second light-emitting unit 302 may also be located outside the first polygon. For example, FIG3 shows a schematic planar structural diagram of a backlight module according to other embodiments of the present disclosure. For greater clarity, FIG3 magnifies a first light-emitting area 201 located at a corner of the array area 101. The backlight module depicted in FIG3 differs from the backlight module depicted in FIG2B in that the second light-emitting unit 302 is positioned differently within the first light-emitting area 201 in which the second light-emitting unit 302 is located. In the embodiment shown in FIG2B , the second light-emitting unit 302 is located inside the first polygon 401, while in the embodiment shown in FIG3 , the second light-emitting unit 302 is located outside the first polygon 401. For example, the second light-emitting unit 302 is located on a side of the plurality of first light-emitting units 301 in its light-emitting area 201, away from the second light-emitting area 202. In FIG3 , three second light-emitting units 302 are provided in the first light-emitting area 201 in which the second light-emitting units 302 are provided. However, according to the embodiments of the present disclosure, it is not limited thereto, and one, two or more second light-emitting units 302 may be provided. In addition, it should be noted that, although the second light-emitting units 302 are provided outside the grid representing the light-emitting area in FIG3 , the grid structure here is merely a virtual grid drawn for the convenience of description. For the first light-emitting area involved, the second light-emitting units 302 located outside the corresponding grid are also regarded as light-emitting units located in the first light-emitting area. As shown above, the multiple light-emitting units in the light-emitting area are connected together in series / parallel so that they can be driven simultaneously. From the following more detailed description of a single light-emitting area, it can be more clearly understood that the second light-emitting unit 302 located outside the grid still belongs to the corresponding first light-emitting area.

[0082] The other parts of the embodiment shown in FIG3 may be the same as the embodiment shown in FIG2B . Therefore, the features of the embodiment shown in FIG2B except for the above-mentioned differences may be applied to the embodiment shown in FIG3 and will not be described in detail here.

[0083] Figure 4 is a schematic diagram illustrating the arrangement and connection of light-emitting units within a light-emitting area according to an embodiment of the present disclosure. In Figure 4, the black bars represent light-emitting units, and the line segments connecting the light-emitting units represent wires. It should be noted that the wires here are merely for illustrating the connection relationship between the light-emitting units and do not represent the specific shape and position of the wires. The wiring connecting the light-emitting units will be described in more detail below. SW and CH in Figure 4 represent two terminals of the wiring used to drive the light-emitting units in the light-emitting area. Through terminals SW and CH, a driving power supply or driving signal can be transmitted to each light-emitting unit, causing the light-emitting unit to emit light in a controlled manner. The light-emitting area shown in Figure 4 can be the second light-emitting area of ​​the backlight module according to an embodiment of the present disclosure. For example, it can be applied to the second light-emitting area 202 in the embodiments shown in Figures 2B and 3. As shown in Figure 4, the light-emitting area includes four light-emitting units 300, the centers of each of which are located at the four vertices of a virtual rectangle (not shown, refer to the second polygon 402 in Figures 2B or 3). For example, the horizontal dimension of the virtual rectangle is A, and the vertical dimension of the virtual rectangle is B. The relationship between Dimension A and Dimension B is not particularly limited and can be determined, for example, based on the lateral and longitudinal dimensions of the array area and the number of light-emitting zones distributed transversely and longitudinally. For example, in some examples, the ratio of the difference between Dimension A and Dimension B to Dimension A can be less than 30%, thereby enabling uniform mixing of light emitted by each light-emitting unit within the light-emitting zone and further improving the planar brightness uniformity of the entire backlight module. As shown in Figure 4, four light-emitting units 300 are connected in series between terminals SW and CH, so that the current flowing through multiple light-emitting units in the same light-emitting zone is the same, and the light intensity emitted is substantially consistent.

[0084] The luminous brightness corresponding to each luminous area of ​​the backlight module is related to the distance between the luminous units in each luminous area and the light mixing distance. For example, the light mixing distance is the distance between the luminous surface of the luminous unit and other optical film layers (for example, a diffuser plate, etc.), which is related to the thickness of the material layer provided between the luminous unit and the optical film layer. For example, the material layer between the luminous unit and the optical film layer may include lamp glue and / or light excitation material (for example, a quantum dot layer). For example, the test position of the luminous area brightness is generally fixed at the center of the luminous area. For example, at the position corresponding to the geometric center of the first polygon or the second polygon mentioned above. When designing the backlight module, in order to make the light shape of a single luminous area more regular, the length and width of a single luminous area are required to be as close as possible. That is, the closer a single luminous area is to a square, the better, and the distance between adjacent luminous units is required to be the same. For a point light source, the light intensity is inversely proportional to the square of the distance. Assuming that the brightness of the luminous unit is L0, the light intensity L1 at the light mixing distance position is:

[0085] Where a is 1 / 2 of the longitudinal dimension B shown in Figure 4, a is 1 / 2 of the transverse dimension A shown in Figure 4, h is the light mixing distance, and n is the number of light-emitting units in the light-emitting area. The longitudinal dimension B and transverse dimension A are the lengths of the two sides of the rectangle connecting the centers of the four light-emitting units.

[0086] For the first light-emitting area located in the peripheral area of ​​the array area, the dimming caused by the halo effect can be compensated by adding chips, so that the brightness distribution of the entire backlight module is more uniform. The following is an exemplary calculation method for calculating the number of light-emitting units to be compensated based on the brightness loss. For example, the brightness of the light-emitting areas at the four corners of the array area loses 50% (for example, about 50% less than the brightness of the second light-emitting area in the central area). In one example, the c value of the light-emitting area (1 / 2 of the length of the diagonal of the above rectangle) is 1.54mm. When the light is mixed to the lower diffuser, the brightness L1 at the center position is L1 = 1.58 * L0. To double L1, it is necessary to add a light-emitting unit at the center position and adjust the mixing distance to 0.8mm. This is only one calculation method for the number of second light-emitting units 302 that need to be added, but according to the embodiments of the present disclosure, it is not limited to this. The number of second light-emitting units 302 to be set can also be determined according to any other suitable method. For example, the relationship between the number of added second light-emitting units and the brightness increase can be found through testing methods, thereby determining the number of second light-emitting units in the light-emitting area of ​​the peripheral area that needs to be adjusted.

[0087] In the following embodiments, examples of the arrangement and connection of light-emitting units in the first light-emitting zone of the backlight module according to embodiments of the present disclosure will be described. It should be noted that the arrangement of the first light-emitting zone described below can be directly applied to the first light-emitting zone 201 shown in Figures 2B and 3. For example, the arrangement and connection of the light-emitting units in the first light-emitting zone shown in Figures 2B or 3 can be arranged, modified, or replaced based on the arrangement and connection of the light-emitting units in the following examples.

[0088] FIG5 is a schematic diagram of the arrangement and connection of the light-emitting units in the light-emitting area according to an embodiment of the present disclosure. In FIG5 , in addition to the first light-emitting unit 301 and the second light-emitting area, a second light-emitting unit 302 is also provided. Since the arrangement of the first light-emitting unit 301 is the same as the arrangement of the light-emitting unit 300 in the second light-emitting area 202, reference can be made to the various features in the embodiment described according to FIG2B , and no further details are given here. Here, the changes in the layout and connection method after the addition of the second light-emitting unit 302 are described in detail. The light-emitting area shown in FIG5 can be applied to the first light-emitting area of ​​the backlight module according to an embodiment of the present disclosure. For example, it can be applied to the first light-emitting area 201 in the embodiment shown in FIG2B .

[0089] As shown in Figure 5, the second light-emitting unit 302 is located inside a first polygon (not shown, see first polygon 401 shown in Figure 2B) formed by connecting the centers of multiple first light-emitting units. The center of a light-emitting unit refers to the geometric center of the orthographic projection of the light-emitting unit on a plane parallel to the substrate 100. This definition is applicable to the first light-emitting unit 301 and the second light-emitting unit 302. For example, the center of the second light-emitting unit 302 is located at the geometric center of the first polygon 401. In some other embodiments, the distance between the center of the second light-emitting unit 302 and the geometric center of the first polygon 401 can be set to be less than 1 / 5 of the shortest side length of the first polygon.

[0090] For example, as shown in FIG5 , the conductive wires located on the substrate 100 and connecting the second light-emitting unit 302 and the plurality of first light-emitting units 301 in series are axially symmetrically distributed relative to a straight line passing through the center of the second light-emitting unit 302. For example, this straight line extends in the lateral direction in FIG5 . The symmetrical distribution of the conductive wires will be more clearly seen in the examples described below in conjunction with the wiring pattern, and will not be described in detail here. For example, in the series structure shown in FIG5 , one side of the second light-emitting unit 302 includes two first light-emitting units 301, and the other side of the second light-emitting unit 302 also includes two first light-emitting units 301. That is, in the series circuit, the number of first light-emitting units 301 located on both sides of the second light-emitting unit 302 is equal.

[0091] 5 , the second light emitting unit 302 has a strip shape extending in a first direction parallel to the substrate 100 (the longitudinal direction in the figure), and the straight line extends in a second direction perpendicular to the first direction and parallel to the substrate 100 (the transverse direction in the figure).

[0092] FIG6 is a schematic diagram of the arrangement and connection of light-emitting units in a light-emitting area according to an embodiment of the present disclosure. The difference between the structure shown in FIG6 and the structure shown in FIG5 is the position of the second light-emitting unit 302. Only this difference is described here, and the same features can be described based on FIG5 and will not be repeated here. As shown in FIG6, the second light-emitting unit is located outside the first polygon (not shown, please refer to FIG3). For example, the second light-emitting unit 302 is located on the side of the plurality of first light-emitting units 301 away from the second light-emitting area 202. As shown in FIG3 and FIG6, at least one first light-emitting area 201 provided with the second light-emitting unit 302 is located at a corner position of the array area 101. The first light-emitting units 301 in the first light-emitting area 201 include a corner light-emitting unit 3012 closest to the corner position, and the second light-emitting unit 302 includes a first edge light-emitting unit 3021 located at the corner light-emitting unit 3012 away from the center of the array area 101. By positioning the first edge light-emitting units 3021 in the aforementioned locations, the light intensity of the multiple first light-emitting units 301 in the first light-emitting zone 201 can be compensated through the halo effect, thereby improving the brightness of the light-emitting zones surrounding the array area. Furthermore, since the first edge light-emitting units 3021 are positioned outside the first polygon, the drive circuits of the first light-emitting units corresponding to the light-emitting units in the second light-emitting zone can be modified less, thereby simplifying the manufacturing process.

[0093] As shown in FIG6 , a first edge lighting unit 3021 is sequentially connected in series with multiple first lighting units 301. In this series circuit, the first edge lighting unit 3021 is located between the multiple first lighting units 301. In some examples, in this series circuit, the number of first lighting units 301 on both sides of the first edge lighting unit 3021 is the same.

[0094] For example, as shown in Figure 6, the distance between the center of the first edge light-emitting unit 3021 and the center of the corner light-emitting unit 3012 in the first light-emitting zone is smaller than the distance between the centers of any two adjacent first light-emitting units 301 in the first light-emitting zone. This arrangement reduces the space required for additional first edge light-emitting units 3021, thereby facilitating a narrow bezel design. Furthermore, this arrangement can better compensate for the brightness of the first light-emitting zone.

[0095] Figure 7 is a schematic diagram illustrating the arrangement and connection of light-emitting units within a light-emitting area according to an embodiment of the present disclosure. The structure shown in Figure 7 differs from that shown in Figure 6 in that the second light-emitting unit 302 is located in a different position. This description will focus solely on this difference, and any features that remain the same will apply the same description based on Figure 6 and will not be repeated.

[0096] As shown in Figures 3 and 7 , first polygon 401 (not shown in Figure 7 for clarity) includes a first side (e.g., the side located at the top in the figure) and a second side (e.g., the side located at the right in the figure) closest to the corner of array region 101. One end of the first side is connected to one end of the second side, and this connection point is the point on the first polygon closest to the corner. Second light-emitting unit 302 includes a second edge light-emitting unit 3022 located on the side of the first side away from the interior of array region 101, and a third edge light-emitting unit 3023 located on the side of the second side away from the interior of array region 101. This arrangement of two second light-emitting units allows for compensation of the luminance of the first light-emitting area from different directions, thereby achieving more uniform luminance.

[0097] For example, as shown in Figure 7, a second edge light-emitting unit 3022 and a third edge light-emitting unit 3023 are connected in series with a first light-emitting unit 301 to form a first series circuit. Other first light-emitting units 301 in the plurality of first light-emitting units 301 are sequentially connected in series to form a second series circuit. The first series circuit and the second series circuit are connected at both ends to form a parallel circuit. In this embodiment, adding two light-emitting units to a complete series connection may result in an excessively large voltage difference between terminal SW and terminal CH. The combination of series and parallel connections in this embodiment can achieve a voltage divider effect.

[0098] For example, as shown in Figure 7, the number of light-emitting units in the first series circuit and the second series circuit is the same. By setting the light-emitting units in the two series circuits to be the same, the light intensity emitted by each light-emitting unit can be made more uniform, which is conducive to the brightness uniformity of the entire backlight module.

[0099] Figure 8 is a schematic diagram illustrating the arrangement and connection of light-emitting units within a light-emitting area according to an embodiment of the present disclosure. The structure shown in Figure 8 differs from that shown in Figure 7 in the number and position of second light-emitting units 302. This description only describes these differences, and any features that remain the same can be applied using the description based on Figure 7 above.

[0100] As shown in Figures 3 and 8 , the first light-emitting area 201 is located at a corner of the array area 101. The first light-emitting units 301 in the first light-emitting area 201 include a corner light-emitting unit 3012 closest to the corner. The second light-emitting units 302 include a first edge light-emitting unit 3021 located away from the center of the array area 101 and away from the corner light-emitting unit 3012. The first polygon 401 includes a first side (e.g., the side located on the upper side in the figure) and a second side (e.g., the side located on the right side in the figure) closest to the corner of the array area 101. One end of the first side is connected to one end of the second side, and the connection point is the point on the first polygon closest to the corner. The second light-emitting units 302 also include a second edge light-emitting unit 3022 located on the side of the first side away from the interior of the array area 101 and a third edge light-emitting unit 3023 located on the side of the second side away from the interior of the array area 101. Therefore, in the embodiment shown in Figure 8 , the number of second light-emitting units is greater than the number of second light-emitting units shown in Figure 7 . It can also be considered that the second light-emitting unit 3021 shown in Figure 6 and the second light-emitting units 3022 and 3023 shown in Figure 7 are all arranged in the same first light-emitting area. Therefore, the combination according to this embodiment can further improve the light intensity at the edges, especially the corners, which is conducive to the brightness uniformity of the backlight module.

[0101] As shown in Figure 8, the second edge light-emitting unit 3022, the first edge light-emitting unit 3021, and the third edge light-emitting unit 3023 are connected in series to form a first series circuit. Multiple first light-emitting units 301 are connected in series to form a second series circuit. The ends of the first series circuit and the second series circuit are connected to each other to form a parallel circuit. This combination of series and parallel connections can also achieve the voltage-dividing effect described in conjunction with Figure 7. Furthermore, in the structure according to this embodiment, the second light-emitting unit 302 is in a separate series circuit. Furthermore, the series connection method in the series circuit of multiple first light-emitting units can be slightly modified to facilitate wiring. For example, compared to the series connection method in the second light-emitting zone, the first light-emitting unit in the upper left corner, the first light-emitting unit in the upper right corner, the first light-emitting unit in the lower left corner, and the first light-emitting unit in the lower right corner can be connected in series in sequence, thereby simplifying wiring for the entire light-emitting zone. In contrast, in the second light-emitting zone, the first light-emitting unit in the upper left corner, the first light-emitting unit in the upper right corner, the first light-emitting unit in the lower right corner, and the first light-emitting unit in the lower left corner are connected in series in sequence, that is, in a clockwise direction.

[0102] Figure 9 is a schematic diagram illustrating the arrangement and connection of light-emitting units within a light-emitting area according to an embodiment of the present disclosure. The structure shown in Figure 9 differs from that shown in Figure 8 in that the light-emitting units are connected in series and parallel. This description only describes this difference, and the same features can be applied using the description based on Figure 8 above and will not be repeated.

[0103] As shown in Figure 9, the second edge light-emitting unit 3022, the first edge light-emitting unit 3021, the third edge light-emitting unit 3023, and one of the first light-emitting units are sequentially connected in series to form a first series circuit. For example, the first light-emitting unit connected in series with the second light-emitting unit is the first light-emitting unit closest to the third edge light-emitting unit, excluding the corner light-emitting unit 3012. The remaining first light-emitting units in the plurality of first light-emitting units are sequentially connected in series to form a second series circuit, with the first and second series circuits connected at both ends to form a parallel circuit.

[0104] In the light-emitting area structure shown in FIG8 and FIG9, for example, the center line of the first edge light-emitting unit 3021 and the second edge light-emitting unit 3022 is parallel to the first side, and the distance from the center of the second edge light-emitting unit 3022 to the first side is 1 / 3 to 1 / 2 of the length of the first side. Such an arrangement can achieve a better brightness compensation effect for the first light-emitting area and a more uniform luminous intensity within the surface.

[0105] In the light-emitting area structure shown in FIG8 and FIG9, for example, the center line of the first edge light-emitting unit 3021 and the third edge light-emitting unit 3023 is parallel to the second side, and the distance from the center of the third edge light-emitting unit 3023 to the second side is 1 / 3 to 1 / 2 of the length of the second side. Such an arrangement can achieve a better brightness compensation effect for the first light-emitting area and a more uniform luminous intensity within the surface.

[0106] In the light-emitting zone structures shown in Figures 8 and 9, three second light-emitting units are added compared to the second light-emitting zone. Therefore, the brightness around the first light-emitting zone is higher. To achieve more uniform brightness across the light-emitting zone, the ratio of the side length of the first polygon 401 to the corresponding side length of the second polygon 402 can be set to be greater than or equal to 2 / 3 and less than 1. In this example, the side length of the first polygon is smaller than the corresponding side length of the second polygon. This arrangement can achieve more uniform brightness across the first light-emitting zone, particularly those located at the corners of the array area.

[0107] Figure 10 is a schematic diagram illustrating the arrangement and connection of light-emitting units within a light-emitting area according to an embodiment of the present disclosure. The structure shown in Figure 10 differs from the structure shown in Figure 8 in the positions of the second and third edge light-emitting units. This description only describes this difference, and the same features can be applied using the description based on Figure 10 above and will not be repeated here.

[0108] In the embodiment shown in FIG10 , the light-emitting area also includes a first edge light-emitting unit 3021, a second edge light-emitting unit 3022, and a third edge light-emitting unit 3023. In the embodiments of FIG8 to FIG10 , the orthographic projection of the second edge light-emitting unit 3022 onto the line along which the first side of the first polygon lies at least partially overlaps with the first side. For example, in the embodiments shown in FIG8 and FIG9 , the perpendicular bisector of the first side passes through the second edge light-emitting unit 3022. Furthermore, in the embodiments of FIG8 to FIG10 , the orthographic projection of the third edge light-emitting unit 3023 onto the line along which the second side of the first polygon lies at least partially overlaps with the second side. For example, in the embodiments shown in FIG8 and FIG9 , the perpendicular bisector of the second side passes through the third edge light-emitting unit 3023. Unlike FIG8 , in the embodiment shown in FIG10 , the second edge light-emitting unit 3022 is closer to the extension line C1 of the second side toward the outside of the array area, while the third edge light-emitting unit 3023 is closer to the extension line C2 of the first side toward the outside of the array area. For example, as shown in FIG. 10 , the extension line C1 of the second side toward the outside of the array area passes through the second edge light emitting unit 3022 , and the extension line C2 of the first side toward the outside of the array area passes through the third edge light emitting unit 3023 .

[0109] The connection method between the light-emitting units in the embodiment shown in Figure 10 is the same as the connection method of the light-emitting units in the embodiment shown in Figure 8, but the embodiments of the present disclosure are not limited thereto. The connection method between the light-emitting units in the embodiment shown in Figure 10 may also adopt the connection method between the light-emitting units in the embodiment shown in Figure 9, that is, three second light-emitting units 302 and one first light-emitting unit 301 are connected in series to form a series circuit.

[0110] In the embodiment shown in FIG10 , the distance between the center of the second edge light emitting unit 3022 and the center of the corner light emitting unit 3012 is less than or equal to the length B of the second side (see FIG8 ), and the distance between the center of the third edge light emitting unit 3023 and the center of the corner light emitting unit 3012 is less than or equal to the length A of the first side (see FIG8 ). In addition, the distance relationship between the second edge light emitting unit 3022 and the third edge light emitting unit 3023 and the first polygon may also satisfy the relationship shown in FIG8 , for example, the distance from the center of the second edge light emitting unit 3022 to the first side is 1 / 3 to 1 / 2 of the length of the first side. The distance from the center of the third edge light emitting unit 3023 to the second side is 1 / 3 to 1 / 2 of the length of the second side. Such an arrangement can achieve a better brightness compensation effect for the first light-emitting area and a more uniform luminous intensity within the surface.

[0111] Figure 11 is a schematic diagram of the wiring structure for driving light-emitting units in a light-emitting zone according to some embodiments of the present disclosure. Figure 11(A) schematically illustrates the wiring structure for driving light-emitting units in a second light-emitting zone or a first light-emitting zone without a second light-emitting unit; Figure 11(B) schematically illustrates the wiring structure for driving light-emitting units in a first light-emitting zone with a second light-emitting unit. As shown in Figure 11(A), the light-emitting zone includes wires 500 connecting the light-emitting units. For example, the wires 500 can be formed by patterning a conductive layer deposited on a substrate. The embodiments of the present disclosure do not particularly limit their specific materials or thickness. In addition, solder pads 501 are provided at the locations for connecting the two electrodes of the light-emitting units 300. For example, the wires 500 are connected to the electrodes of the light-emitting units via the solder pads. Thus, the light-emitting units 300 are connected in series via the wires and solder pads. When a driving power source or driving signal is applied from terminals SW and CH, these light-emitting units 300 can be driven to emit light. Because the light-emitting units 300 in this light-emitting zone are connected in series, they can be driven to emit light simultaneously. FIG11(B) is a schematic diagram of the wiring structure of the first light-emitting zone according to an embodiment of the present disclosure. This structure can be applied to the case where the added second light-emitting unit is arranged on the inner side of the first polygon. As can be seen from the figure, based on the wiring structure of the second light-emitting zone, the middle of one end of the C-shaped wire is disconnected and a solder pad 501 is added, so that the added second light-emitting unit 302 can be connected in series to the circuit structure. If the wiring structure of the second light-emitting zone is regarded as the original design and the wiring structure of the first light-emitting zone is regarded as a modified design, the changes between the two can be relatively small, so that the number of light-emitting units in the first light-emitting zone can be adjusted while being compatible with the original process.

[0112] Figure 12 is a schematic diagram of the local wiring structure of the light-emitting area including the second light-emitting unit in the backlight module according to an embodiment of the present disclosure. Figure 12 shows a first light-emitting area and three second light-emitting areas located in the upper right corner. For example, the terminals SW of the light-emitting areas in a row are connected to the same first power line 502. For example, the power line can also be called a signal line. At least some of the light-emitting units in a column can be connected to different second power lines 503, but the embodiments of the present disclosure are not limited to this. As long as different light-emitting units are not connected to exactly the same first power line and second power line, independent light-emitting control can be achieved. For example, the second power line can include a first part 5031 and a second part 5032. The first part 5031 extends horizontally and can be located on the same layer as the wires of the light-emitting units in the series light-emitting area, while the second part 5032 extends vertically and can be located on a different layer from the first part 5031, but the two are electrically connected to each other.

[0113] FIG13 is a schematic diagram of the planar structure of the backlight module according to an embodiment of the present disclosure. For a plurality of light-emitting areas arranged in an array in the backlight module, they can be driven in a grouped manner. For example, each group of light-emitting areas is connected to one or a set of drivers. For example, in the backlight module according to an embodiment of the present disclosure, it may include a plurality of drive areas 601, and the light-emitting units within the drive area are controlled by the driver 603 corresponding to the drive area 601 for light emission. For example, the driver 603 of the drive area 601 is located on one side of the array area, and the light-emitting area located in the drive area 601 is connected to the driver 603.

[0114] For example, FIG13 schematically illustrates four drive regions 601, but the embodiments of the present disclosure are not limited thereto. For example, each drive region 601 is provided with a corresponding driver 603, and multiple light-emitting areas located in the drive region 601 can be connected to the driver 603 via wires through a fan-out region between the array region and the driver 601.

[0115] FIG14 is a schematic diagram of a partial planar structure of a backlight module according to an embodiment of the present disclosure. FIG14 only shows a partial structure in one driving area 601. As shown in FIG14, each driving area 601 includes multiple sub-driving areas 6011, and each sub-driving area 6011 includes multiple light-emitting areas 200 arranged in row and column directions (shown simplified as blocks in FIG14). For example, each sub-driving area in FIG14 schematically shows four rows and seven columns of light-emitting areas, but this is merely exemplary and is not limited to this according to the embodiments of the present disclosure. For example, the first terminals SW of the multiple light-emitting areas in each sub-driving area 6011 are connected to the same first power line 502, and the first terminals SW of the multiple light-emitting areas 200 in different sub-driving areas 6011 are connected to different first power lines 502. For example, as shown in FIG14, the first power line 502 includes multiple wires extending laterally, each of which is connected to a row of light-emitting areas in the sub-driving area 6011. The first power lines 502 further include a longitudinally extending connecting wire 5021. The longitudinally extending wire 5021 electrically connects multiple transversely extending wires in the same sub-driving region 6011. Therefore, these electrically connected first power lines in the same sub-driving region 6011 that connect the first terminals SW of multiple light-emitting areas are collectively referred to as a single first power line.

[0116] As shown in Figure 14, the second terminals CH of multiple light-emitting areas 200 in the same sub-driving area 6011 are respectively connected to different second power lines 503, and the light-emitting areas 200 located in different sub-driving areas 6011 and in the same column include light-emitting areas connected to the same second power line 503.

[0117] In some examples, in different sub-drive regions within the same drive region, multiple light-emitting regions located in two sub-drive regions and in the same column correspond to each other, and the second terminals of the corresponding light-emitting regions are connected to the same second power line. As shown in FIG14 , in the leftmost column of light-emitting regions, in the column direction, the first light-emitting region 200 of the upper sub-drive region 6011 and the first light-emitting region 200 of the lower sub-drive region 6011 are connected to the same second power line 503; the second light-emitting region 200 of the upper sub-drive region 6011 and the second light-emitting region 200 of the lower sub-drive region 6011 are connected to the same second power line 503; the third light-emitting region 200 of the upper sub-drive region 6011 and the third light-emitting region 200 of the lower sub-drive region 6011 are connected to the same second power line 503; and the fourth light-emitting region 200 of the upper sub-drive region 6011 and the fourth light-emitting region 200 of the lower sub-drive region 6011 are connected to the same second power line 503. The connection method for the light-emitting regions in other columns is similar and will not be repeated here. By setting it in this way, the wiring method can be simplified, and independent driving of each light-emitting area can also be achieved.

[0118] In addition, as shown in FIG14 , the first power line 502 in each sub-driving region 6011 is connected to a driver (not shown) through different power lines 504 .

[0119] Figure 15 is a schematic diagram of the partial cross-sectional structure of the backlight module according to an embodiment of the present disclosure. As can be seen from Figure 15, the light-emitting unit 300 is connected to the substrate 100 through a solder pad, thereby connecting to the wires on the substrate to receive a driving signal or a driving power supply. A reflective structure 700 is provided around the light-emitting unit 300. For example, the reflective structure 700 is a white glue laid on the substrate 100. A plurality of groove structures are formed in the white glue, and the light-emitting unit is located in the groove in the white glue, so that the white glue structure located around the light-emitting unit 300 can reflect the light emitted from the light-emitting unit 300, so that the light is emitted more concentratedly upward. In addition, since a plurality of array-arranged grooves are formed in the white glue corresponding to the plurality of light-emitting units, the white glue layer is formed into a grid structure, which can also be called a white glue grid. A transparent glue layer 800 can be provided in the groove of the white glue and above the light-emitting unit 300 to protect the light-emitting unit 300.

[0120] The light-emitting unit usually adopts a light-emitting diode chip. Since the manufacturers of the light-emitting units have multiple brightness grades for products of the same specifications, the brightness uniformity of the backlight module can be improved by distributing light-emitting units of different brightness grades in different areas. This solution mainly achieves brightness compensation by screening out light-emitting units of high brightness grades and arranging them. It mainly targets the light-emitting areas in the peripheral areas of the array area, especially the light-emitting areas at the corners, and arranges light-emitting units of appropriate brightness grades to perform brightness compensation. For example, the light-emitting units of the highest brightness grade can be set at the corner positions of the array area, the light-emitting areas outside the corners of the edge positions of the array area can be set at medium brightness grade light-emitting units, and the light-emitting areas inside can be set at low brightness grade light-emitting units. Therefore, embodiments of the present disclosure further provide a backlight module comprising: a substrate including an array region, wherein the array region is provided with a plurality of light-emitting zones arranged in an array, wherein the array region includes a peripheral region and a central region located inside the peripheral region, wherein the plurality of light-emitting zones include a plurality of first light-emitting zones located in the peripheral region and a plurality of second light-emitting zones located in the central region, wherein each of the first light-emitting zones and each of the second light-emitting zones includes a plurality of light-emitting units, wherein the number of light-emitting units provided in each of the first light-emitting zones and each of the second light-emitting zones is equal and the arrangement is the same, and when the same power signal is input, the light-emitting intensity of the light-emitting units in at least one of the first light-emitting zones is greater than the light-emitting intensity of the light-emitting units in the second light-emitting zones. For example, the planar shape of the array region includes a polygon, and at least one first light-emitting zone is located at at least one corner of the array region. This solution for improving the brightness of the peripheral region reduces costs because it does not require changes to the wiring design. Furthermore, this solution can be used in conjunction with the aforementioned solution of adding light-emitting units to the peripheral light-emitting region. For example, in addition to adding light-emitting units, the brightness levels of the light-emitting units in different regions can also be differentiated and arranged.

[0121] The above describes backlight modules according to some embodiments of the present disclosure. The features of the above embodiments may be combined with each other. For example, the first polygon and the second polygon are shown as rectangles in the figure, but the embodiments of the present disclosure are not limited to this. For example, the light-emitting unit may be in the shape of a strip extending along a first direction, and the first direction may be the direction in which the long side of the rectangle extends, that is, the first direction is parallel to the long side of the rectangle.

[0122] Furthermore, according to an embodiment of the present disclosure, a display device is provided, comprising a backlight module according to any of the aforementioned embodiments. For example, the display device is a liquid crystal display device, comprising a liquid crystal display panel, with the backlight module disposed on one side of the liquid crystal display panel. Since the display device comprises a backlight module according to any of the aforementioned embodiments, it also possesses the technical effects provided by the aforementioned backlight module, which will not be further elaborated here.

[0123] At present, the algorithms for white screens all require that the current and voltage of each luminous area of ​​the backlight are consistent, and the transmittance of each partition of the display panel is consistent, and the final measured brightness uniformity is low. According to an embodiment of the present disclosure, a driving method for a display device is also provided. For example, the display device includes a backlight module and a liquid crystal display panel stacked on each other, the backlight module includes an array area, and a plurality of luminous areas that are independently driven and arranged in an array are provided in the array area. The array area includes a peripheral area and a central area inside the peripheral area. The plurality of luminous areas include a plurality of first luminous areas located in the peripheral area and a plurality of second luminous areas located in the central area. The liquid crystal display panel includes a plurality of sub-display areas, and the sub-display areas include a plurality of first sub-display areas corresponding one-to-one to the plurality of first luminous areas and a plurality of second sub-display areas corresponding one-to-one to the plurality of second luminous areas. The method includes: driving the plurality of luminous areas to emit light and driving the transmittance of the plurality of sub-display areas to display images. For example, the plurality of first light-emitting areas and the plurality of second light-emitting areas can be driven to emit light so that the ratio of the light intensity emitted by at least one of the plurality of first light-emitting areas to the grayscale value to be displayed by the corresponding first sub-display area is greater than the ratio of the light intensity emitted by the second light-emitting area to the grayscale value to be displayed by the corresponding second sub-display area; and / or the plurality of first sub-display areas and the plurality of second sub-display areas can be driven to display so that the ratio of the transmittance of at least one of the plurality of first sub-display areas to the grayscale value to be displayed by the first sub-display area is greater than the ratio of the transmittance of the second sub-display area to the grayscale value to be displayed by the second sub-display area. Since the backlight module using HDR technology itself can realize independent control of multiple light-emitting areas, and different pixels of the display panel can also be independently controlled, there is no need to change the structure of the product, and the problem of dimming of the peripheral area mentioned above can be solved by changing the driving method, thereby saving costs.

[0124] For example, Figure 16 shows a schematic diagram of the drive signal without differentiating and regulating the peripheral and inner luminous zones; Figure 17 shows a schematic diagram of the drive signal with differentiating and regulating the peripheral and inner luminous zones. Each column in Figures 16 and 17 represents a luminous zone, and the height of the column represents the magnitude of the drive signal. For example, the magnitude of the drive signal can include the magnitude of the drive voltage or the magnitude of the drive current. For example, in Figure 16, when displaying a white screen, the same drive signal is applied to each luminous zone (see the vertical axis in the figure); however, in Figure 17, the drive signal applied to the luminous zones at the corners is greater than the drive signal for the luminous zones at the edges, excluding the corners. The drive signal for the outermost luminous zone (one circle) is greater than the drive signal for the next outermost luminous zone, and the drive signal for the next outermost luminous zone is greater than the signal for the luminous zones further inward. The distribution shown in Figure 17 is merely illustrative; it is not necessary to gradually adjust the drive signal magnitude for multiple luminous zones. Therefore, the drive signal can be enhanced only for the outermost luminous zones or the corners.

[0125] For example, the driving method of this embodiment mainly uses the local dimming algorithm to perform different processing and control on the algorithms of different luminous areas of the backlight, and the differences are mainly in the positions of the three outermost layers of luminous areas. For example, the brightness of the four corner positions is adjusted to 2 times that of the middle area (the central area after removing the three outer circles), and the brightness of the four sides of the outermost partition is adjusted to 1.3-1.4 times that of the middle area (the brightness of the four sides of the outermost partition is about 25% lower than that of the center area). The brightness decreases to 1 from the edge partition to the middle area (only the settings of the three outer layers are different). The algorithm brightness of the fourth layer of partition to the middle area is consistent.

[0126] For example, the backlight algorithm according to regional dimming controls the output signal through the driver. For example, the above-mentioned partition control is mainly achieved through the driving power consumption of the driver, and the change in power consumption is achieved through the duty cycle of the driving signal (eg, current).

[0127] For example, when driving different sub-display areas of a display panel to display the same grayscale value, the transmittance of the first sub-display area can be made greater than the transmittance of the second sub-display area, thereby improving the problem of peripheral darkening during display. Since each sub-pixel of the display panel can be independently controlled, the sub-display area including multiple sub-pixels can also be independently controlled. This driving method solves the problem of peripheral darkening without adding additional costs. In addition, this method is not limited to the case where the same grayscale value is to be displayed. For example, when the grayscale values ​​at different locations in the displayed image are different, a similar technical effect can be achieved by setting the ratio of the transmittance of at least one first sub-display area among the multiple first sub-display areas to the grayscale value to be displayed by the first sub-display area to be greater than the ratio of the transmittance of the second sub-display area to the grayscale value to be displayed by the second sub-display area.

[0128] There are a few points to note:

[0129] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure, and other structures may refer to conventional designs.

[0130] (2) Unless there is any conflict, the features of the same embodiment and different embodiments of the present disclosure may be combined with each other.

[0131] The above are only specific embodiments of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A backlight module, comprising: The substrate comprises an array region, wherein a plurality of light-emitting regions arranged in an array are arranged in the array region. The array region includes a peripheral region and a central region located inside the peripheral region, the plurality of light-emitting regions include a plurality of first light-emitting regions located in the peripheral region and a plurality of second light-emitting regions located in the central region, each of the first light-emitting regions and each of the second light-emitting regions includes a plurality of light-emitting units, The number of the light-emitting units arranged in at least two of the plurality of second light-emitting areas is equal, The plurality of light-emitting units in the first light-emitting area include a plurality of first light-emitting units corresponding one-to-one to the plurality of light-emitting units in each of the at least two second light-emitting areas, the centers of the plurality of first light-emitting units in the first light-emitting area are located at respective vertices of a first polygon, the centers of the light-emitting units in each of the at least two second light-emitting areas are located at respective vertices of a second polygon, and the first polygon and the second polygon are similar figures. The plurality of light emitting units of at least one first light emitting area of ​​the plurality of first light emitting areas further includes a second light emitting unit.

2. The backlight module according to claim 1, wherein: The first polygon and the second polygon are identical in size and shape.

3. The backlight module according to claim 1, wherein: The side length of the first polygon is smaller than the corresponding side length of the second polygon.

4. The backlight module according to claim 1, wherein: The second light emitting unit is located inside the first polygon.

5. The backlight module according to claim 4, wherein: A distance between a center of the second light-emitting unit and a geometric center of the first polygon is less than 1 / 5 of a length of a shortest side of the first polygon.

6. The backlight module according to claim 5, wherein: The center of the second light emitting unit is located at the geometric center of the first polygon.

7. The backlight module according to any one of claims 4 to 6, wherein: The second light emitting unit and the plurality of first light emitting units are connected in series.

8. The backlight module according to claim 7, further comprising: A conductive wire is located on the substrate and connects the second light emitting unit and the plurality of first light emitting units in series, wherein the conductive wire is axially symmetrically distributed with respect to a straight line passing through the center of the second light emitting unit.

9. The backlight module according to claim 8, wherein: The second light emitting unit has a strip shape extending in a first direction parallel to the substrate, and the straight line extends in a second direction perpendicular to the first direction and parallel to the substrate.

10. The backlight module according to claim 1, wherein: The second light emitting unit is located outside the first polygon.

11. The backlight module according to claim 10, wherein: The second light emitting unit is located at a side of the plurality of first light emitting units away from the second light emitting area.

12. The backlight module according to claim 10 or 11, wherein: At least one first light-emitting area in which the second light-emitting units are provided is located at a corner position of the array area, wherein the first light-emitting units in the first light-emitting area include a corner light-emitting unit closest to the corner position, and the second light-emitting units include a first edge light-emitting unit located at the corner light-emitting unit away from the center of the array area.

13. The backlight module according to claim 12, wherein: The first edge light-emitting unit is connected in series with the plurality of first light-emitting units, and in the series circuit of the first edge light-emitting unit and the plurality of first light-emitting units, the first edge light-emitting unit is located between the plurality of first light-emitting units.

14. The backlight module according to claim 13, wherein: In the series circuit, the number of the first light-emitting units on both sides of the first edge light-emitting unit is the same.

15. The backlight module according to any one of claims 12 to 14, wherein: A distance between a center of the first edge light-emitting unit and a center of the corner light-emitting unit in the first light-emitting area is smaller than a distance between centers of any two adjacent first light-emitting units in the first light-emitting area.

16. The backlight module according to claim 10, wherein: The first polygon includes a first side and a second side that are closest to a corner position of the array area, and one end of the first side is connected to one end of the second side, and the second light-emitting unit includes a second edge light-emitting unit located on a side of the first side away from the interior of the array area and a third edge light-emitting unit located on a side of the second side away from the interior of the array area.

17. The backlight module according to claim 16, wherein: The second edge light-emitting unit and the third edge light-emitting unit are connected in series with one of the first light-emitting units to form a first series circuit, the one first light-emitting unit connected in series with the multiple second light-emitting units is a first light-emitting unit other than the corner light-emitting unit that is closest to the third edge light-emitting unit, and the other first light-emitting units among the multiple first light-emitting units are connected in series in sequence to form a second series circuit, and the two ends of the first series circuit and the second series circuit are respectively connected to each other to form a parallel circuit.

18. The backlight module according to claim 17, wherein: The number of light emitting units in the first series circuit and the number of light emitting units in the second series circuit are the same.

19. The backlight module according to claim 10, wherein: The first light-emitting area is located at a corner position of the array area, wherein the first light-emitting units in the first light-emitting area include a corner light-emitting unit closest to the corner position, the second light-emitting units include a first edge light-emitting unit located at the corner light-emitting unit away from the center of the array area, the first polygon includes a first side and a second side closest to the corner position of the array area, and one end of the first side is connected to one end of the second side, and the second light-emitting units include a second edge light-emitting unit located on a side of the first side away from the interior of the array area and a third edge light-emitting unit located on a side of the second side away from the interior of the array area.

20. The backlight module according to claim 19, wherein: The second edge light-emitting unit, the first edge light-emitting unit and the third edge light-emitting unit are connected in series in sequence to form a first series circuit, the multiple first light-emitting units are connected in series to form a second series circuit, and the two ends of the first series circuit and the second series circuit are respectively connected to each other to form a parallel circuit.

21. The backlight module according to claim 19, wherein: The second edge light-emitting unit, the first edge light-emitting unit, the third edge light-emitting unit and one of the first light-emitting units are connected in series in sequence to form a first series circuit, the one first light-emitting unit connected in series with the plurality of second light-emitting units is a first light-emitting unit other than the corner light-emitting unit that is closest to the third edge light-emitting unit, the other first light-emitting units among the plurality of first light-emitting units are connected in series in sequence to form a second series circuit, and the two ends of the first series circuit and the second series circuit are respectively connected to each other to form a parallel circuit.

22. The backlight module according to any one of claims 19 to 21, wherein: The center line of the first edge light emitting unit and the second edge light emitting unit is parallel to the first side, and the distance from the center of the second edge light emitting unit to the first side is 1 / 3 to 1 / 2 of the length of the first side.

23. The backlight module according to any one of claims 19 to 22, wherein: The center line of the first edge light emitting unit and the third edge light emitting unit is parallel to the second side, and the distance from the center of the third edge light emitting unit to the second side is 1 / 3 to 1 / 2 of the length of the second side.

24. The backlight module according to any one of claims 19 to 23, wherein: A ratio of a side length of the first polygon to a corresponding side length of the second polygon is greater than or equal to 2 / 3 and less than 1.

25. The backlight module according to claims 19-24, wherein: The orthographic projection of the second edge light-emitting unit on the straight line where the first side of the first polygon is located at least partially overlaps with the first side, and the orthographic projection of the third edge light-emitting unit on the straight line where the second side of the first polygon is located at least partially overlaps with the second side.

26. The backlight module according to claim 25, wherein: The perpendicular bisector of the first side passes through the second edge light-emitting unit, and the perpendicular bisector of the second side passes through the third edge light-emitting unit.

27. The backlight module according to claim 25, wherein: An extension line of the second side toward the outside of the array area passes through the second edge light-emitting unit, and an extension line of the first side toward the outside of the array area passes through the third edge light-emitting unit.

28. The backlight module according to any one of claims 1 to 27, wherein: The first polygon and the second polygon each include a rectangular shape.

29. The backlight module according to claim 28, wherein: The plurality of light emitting units are all in a strip shape extending along a first direction, wherein the first direction is parallel to a long side of the rectangular shape.

30. The backlight module according to claims 1-29, wherein: Each light emitting area includes a first terminal and a second terminal to provide driving power to a plurality of light emitting units in the light emitting area, and each light emitting area is configured to be driven independently of each other.

31. The backlight module according to claim 30, wherein: The array region includes a plurality of driving regions, and the light emitting area of ​​each driving region is connected to a driver located at one side of the array region.

32. The backlight module according to claim 31, wherein: Each of the driving regions includes a plurality of sub-driving regions, each of the sub-driving regions includes a plurality of the light-emitting regions arranged along a row direction and a column direction, and first terminals of the plurality of light-emitting regions in each sub-driving region are connected to the same first power line, and first terminals of the plurality of light-emitting regions in different sub-driving regions are connected to different first power lines.

33. The backlight module according to claim 32, wherein: The second terminals of the plurality of light-emitting areas in the same sub-driving region are respectively connected to different second power lines, and the light-emitting areas in different sub-driving regions and in the same column include light-emitting areas connected to the same second power line.

34. The backlight module according to claim 33, wherein: In different sub-driving areas in the same driving area, a plurality of light-emitting areas located in two sub-driving areas and in the same column correspond to each other one by one, and second terminals of the light-emitting areas corresponding to each other are connected to the same second power line.

35. The backlight module according to any one of claims 1 to 34, wherein: A reflective structure is disposed around at least some of the plurality of light emitting units, the reflective structure is formed with a recess corresponding to the light emitting unit, and the light emitting unit is disposed in the recess.

36. A backlight module, comprising: The substrate comprises an array region, wherein a plurality of light-emitting regions arranged in an array are arranged in the array region. The array region includes a peripheral region and a central region located inside the peripheral region, the plurality of light-emitting regions include a plurality of first light-emitting regions located in the peripheral region and a plurality of second light-emitting regions located in the central region, each of the first light-emitting regions and each of the second light-emitting regions includes a plurality of light-emitting units, The number of the light-emitting units arranged in each of the first light-emitting areas and each of the second light-emitting areas is equal and the arrangement is the same, In a state where the same power signal is input, the light emission intensity of the light emitting unit in at least one of the first light emitting areas is greater than the light emission intensity of the light emitting unit in the second light emitting area.

37. The backlight module according to claim 36, wherein: The planar shape of the array area includes a polygon, and the at least one first light-emitting area is located at at least one corner of the array area.

38. A display device comprising the backlight module according to any one of claims 1-37.

39. A method for driving a display device, the display device comprising a backlight module and a liquid crystal display panel stacked on each other, the backlight module comprising an array area, the array area being provided with a plurality of light-emitting areas which are independently driven and arranged in an array, the array area comprising a peripheral area and a middle area located inside the peripheral area, the plurality of light-emitting areas comprising a plurality of first light-emitting areas located in the peripheral area and a plurality of second light-emitting areas located in the middle area, the liquid crystal display panel comprising a plurality of sub-display areas, the sub-display areas comprising a plurality of first sub-display areas corresponding one-to-one to the plurality of first light-emitting areas and a plurality of second sub-display areas corresponding one-to-one to the plurality of second light-emitting areas, the method comprising: The plurality of light-emitting areas are driven to emit light and the transmittance of the plurality of sub-display areas is driven to display an image, wherein The plurality of first light-emitting areas and the plurality of second light-emitting areas are driven to emit light, so that the plurality of first light-emitting areas The ratio of the light intensity emitted by at least one of the light-emitting areas to the grayscale value to be displayed in the corresponding first sub-display area is greater than the ratio of the light intensity emitted by the second light-emitting area to the grayscale value to be displayed in the corresponding second sub-display area; and / or The multiple first sub-display areas and the multiple second sub-display areas are driven to perform display so that the ratio of the transmittance of at least one first sub-display area among the multiple first sub-display areas to the grayscale value to be displayed in the first sub-display area is greater than the ratio of the transmittance of the second sub-display area to the grayscale value to be displayed in the second sub-display area.

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